Converting an inground fountain into a pond

Joined
Jun 29, 2020
Messages
14
Reaction score
11
Hardiness Zone
7a
Country
United States
Hi All,

Brand new member here. I have had fish tanks my entire life and now venturing into the pond game. I like in zone 7a/b. I have an existing circular fountain which is a magnet for dirty water since it sits next to a large oak tree. Its about 8 ft all around. I had a few questions

1) What's the minimum depth recommended for my zone? I was thinking anywhere from 24-36 in?
2) I am thinking of putting making it a goldfish pond. How soon after the pond has been converted can I put fish in? Do you recommend any water cleaner solution, etc.?
3) There is going to be a skimmer which should help clean up some of the oak tree tassels. Do you recommend anything else that would help keep it clean?
4) Any and all other suggestions are welcome :)

I have attached a pic of the fountain in its current state
 

Attachments

  • Fountain.jpg
    Fountain.jpg
    291 KB · Views: 161

Mmathis

TurtleMommy
Joined
Apr 28, 2011
Messages
14,271
Reaction score
8,324
Location
NW Louisiana -- zone 8b
Hardiness Zone
8b
Country
United States
Hello and welcome! Nice fountain!

Approx. how many gallons do you plan to shoot for?

When you say “converting into a pond,” do you plan to do away with the existing structure and rebuild, or simply modify the fountain in some way (as in, just add a liner)? It does appear to be partially above ground.

What is your vision for this spot?

How deep is the fountain now? You could probably get away with 2’ in depth. Folks in the colder parts of the country look to depth so the fish can go deep in winter and avoid freezing, while folks in my part of the country (South/Southwest) look for depth so the fish don’t overheat in the hotter months.

A skimmer will certainly help with plant debris! I assume that the wall area is a waterfall (lovely!). Will you still use that and are you planning to have any other type of filtration? There are lots of options for filtration, but a lot of us are converting to bog (plant) filtration. Does that spot get any sunlight?

As far as adding fish, if you start with just a few, you can add them right away. If your source water is chlorinated, always add a dechlorinator to the water first. If you’ve had aquariums, you know about “cycling” the pond (nitrogen cycle). Go slow and don’t add a lot of fish at one time. Monitor your water with a liquid (drops, not strips) water test kit. Most of us use the API Master kit, but as an add-on, also get tests for KH and GH.

As far as other additives to the water, we tend to advise against this. Things like nitrifying bacteria, algaecides, or water clarifiers are not necessary. If you keep your fish load manageable (don’t overstock), don’t over feed, and with the addition of plants, Mother Nature will keep your pond in balance. A newly cycled pond (and again, at the beginning of each spring season) will go through an algae bloom. This is very normal. Algae on the liner is good algae and is beneficial — you want that to develop. Suspended algae and string algae (usually what happens in the spring) will go away on its own. It is a symptom not a disease! It means there are more nutrients in the water than the biological filter is capable of handling. Plants, lots of water movement (for filtration and oxygenation) will help. Over feeding and too many fish will contribute to the problem.

Now, there is a way to do your initial cycle without fish — fishless cycling. Google that or search on here for more information.

And I’m rambling on.... Let’s see what other folks have to say. You will probably get better answers than mine!
 
Joined
Jun 29, 2020
Messages
14
Reaction score
11
Hardiness Zone
7a
Country
United States
Hello and welcome! Nice fountain!

Approx. how many gallons do you plan to shoot for?

When you say “converting into a pond,” do you plan to do away with the existing structure and rebuild, or simply modify the fountain in some way (as in, just add a liner)? It does appear to be partially above ground.

What is your vision for this spot?

How deep is the fountain now? You could probably get away with 2’ in depth. Folks in the colder parts of the country look to depth so the fish can go deep in winter and avoid freezing, while folks in my part of the country (South/Southwest) look for depth so the fish don’t overheat in the hotter months.

A skimmer will certainly help with plant debris! I assume that the wall area is a waterfall (lovely!). Will you still use that and are you planning to have any other type of filtration? There are lots of options for filtration, but a lot of us are converting to bog (plant) filtration. Does that spot get any sunlight?

As far as adding fish, if you start with just a few, you can add them right away. If your source water is chlorinated, always add a dechlorinator to the water first. If you’ve had aquariums, you know about “cycling” the pond (nitrogen cycle). Go slow and don’t add a lot of fish at one time. Monitor your water with a liquid (drops, not strips) water test kit. Most of us use the API Master kit, but as an add-on, also get tests for KH and GH.

As far as other additives to the water, we tend to advise against this. Things like nitrifying bacteria, algaecides, or water clarifiers are not necessary. If you keep your fish load manageable (don’t overstock), don’t over feed, and with the addition of plants, Mother Nature will keep your pond in balance. A newly cycled pond (and again, at the beginning of each spring season) will go through an algae bloom. This is very normal. Algae on the liner is good algae and is beneficial — you want that to develop. Suspended algae and string algae (usually what happens in the spring) will go away on its own. It is a symptom not a disease! It means there are more nutrients in the water than the biological filter is capable of handling. Plants, lots of water movement (for filtration and oxygenation) will help. Over feeding and too many fish will contribute to the problem.

Now, there is a way to do your initial cycle without fish — fishless cycling. Google that or search on here for more information.

And I’m rambling on.... Let’s see what other folks have to say. You will probably get better answers than mine!
Thank you so much for your advise. This is very helpful!

The fountain now is a little over a foot. I am planning on digging it deeper with an depth ranging from 24-36 in. Using a gallon calculate I found online, at a diameter of 8ft and using 3ft as dept, its around 1000 gallons. I am planning on putting liner in. Yes, the wall has a waterfall, but there is also a waterfall under that small tree to the right of the fountain. The area gets partial sunlight. I like the idea of BOG filtration. I am very excited to see to see the end product and will definitely post pictures.
 

Mmathis

TurtleMommy
Joined
Apr 28, 2011
Messages
14,271
Reaction score
8,324
Location
NW Louisiana -- zone 8b
Hardiness Zone
8b
Country
United States
Awesome! I hope you are able to reproduce the rustic look of the stonework! That is gorgeous!

One thing to please keep in mind — the rules of ponding:
  1. There are no rules — more or less.....
  2. Use common sense, look at the science of healthy water, and don’t believe something just because someone says it’s true!
  3. Most commercial products will consume your wallet
  4. If/when you make changes or are trouble shooting — make one change at a time! If you do 3 or 4 interventions at the same time, you won’t have any way to know which one of them actually took care of the problem!
  5. Do your research, and go to many sources for advice. If it seems too good to be true, question it!
  6. No 2 ponds are alike! What works for one person may not be best for the next person.
  7. A general rule of thumb (but not everyone does it and they don’t have problems) is to quarantine any new fish before you add them to the pond (not for your first fish, but for later additions)! I’ll let you read up on this.
  8. goldfish (and koi) are freshwater fish. You will see people routinely adding salt to their ponds. I’m not going to say that this is wrong, but I prefer to only use salt as a treatment in an isolation container.
  9. if you “treat” your fish for a medical problem, try to determine WHAT the cause is and don’t Indiscriminately add various treatments or antibiotics
  10. Be on the lookout for fish predators that might be in your area! Cranes, herons, cats, raccoons......
  11. BE PATIENT! BE PATIENT!! BE PATIENT!!!
 
Joined
Jun 29, 2020
Messages
14
Reaction score
11
Hardiness Zone
7a
Country
United States
Quick question, should I put gravel or stones on the bottom OR leave it plain liner? I am thinking adding pebbles or large stones
 

Mmathis

TurtleMommy
Joined
Apr 28, 2011
Messages
14,271
Reaction score
8,324
Location
NW Louisiana -- zone 8b
Hardiness Zone
8b
Country
United States
Quick question, should I put gravel or stones on the bottom OR leave it plain liner? I am thinking adding pebbles or large stones
You will get all kinds of opinions on this, and the only CORRECT answer is...”it depends.” Some people use rocks/stones, and some leave the liner bare. Someone else recently asked about using sand. Some koi purists would cringe at the idea of having ANYTHING in their ponds, other than fish. So, you will get answers all along the spectrum.

You have to do your homework and decide what is best for you! Pond bottoms are going to collect crud. Some believe that rocks and stones add to the biodiversity of the pond. Some (like the koi purists) don’t want biodiversity — they want sterility. As long as you know that crud happens, you decide how to go.
 
Joined
Jun 29, 2020
Messages
14
Reaction score
11
Hardiness Zone
7a
Country
United States
A few pics of the conversion. Waiting for the water to clear up. How long does that usually take? I have heard/read two days to 4 weeks!

5BAAE0C6-F8D7-445E-8A6B-832F7DE6B5D5.jpeg
 

Attachments

  • C92B570A-4DF1-44FF-B7C1-7639ECE2D71D.jpeg
    C92B570A-4DF1-44FF-B7C1-7639ECE2D71D.jpeg
    313.4 KB · Views: 128
  • 9D9836AE-A40D-4014-B7D5-C85E25E5E7AC.jpeg
    9D9836AE-A40D-4014-B7D5-C85E25E5E7AC.jpeg
    314.1 KB · Views: 109
  • 6653D718-A905-44F8-8A3E-5E2A6FF757D6.jpeg
    6653D718-A905-44F8-8A3E-5E2A6FF757D6.jpeg
    375 KB · Views: 113
Joined
Oct 28, 2013
Messages
13,367
Reaction score
13,789
Location
Northern IL
Showcase(s):
1
Welcome! What a beautiful pond you are creating!

How long the water takes to clear depends on a few factors - how much "stuff" is there in the water, how much and what type of filtration you have, how much water, etc. Just know... it will happen!

@Mmathis gave you lots of good pointers, so I can't add anything more than what she already said. In short - your pond is unique. Read read read and then take what works for you. One thing I will say - ponds and aquariums are EXACTLY alike in one way... they both have water! Other than that, it's a whole new world that awaits! I say this as the wife of a former aquarium enthusiast who had to "unlearn" everything he knew about keeping fish... it's just not the same! All of the tinkering and adjusting and testing that goes into an aquarium is just not really necessary in a garden pond once it gets established.
 

addy1

water gardener / gold fish and shubunkins
Moderator
Joined
Jun 23, 2010
Messages
44,922
Reaction score
29,914
Location
Frederick, Maryland
Showcase(s):
1
Hardiness Zone
6b
Country
United States
Very nice build! Glad you joined the forum!
 
Joined
Jun 29, 2020
Messages
14
Reaction score
11
Hardiness Zone
7a
Country
United States
Finished pics
 

Attachments

  • 5FF4EECA-0080-4248-BE52-D76BD8031DC6.jpeg
    5FF4EECA-0080-4248-BE52-D76BD8031DC6.jpeg
    221.4 KB · Views: 110
  • 29E2DA8E-D87B-465E-B841-325450CBFEC6.jpeg
    29E2DA8E-D87B-465E-B841-325450CBFEC6.jpeg
    222.9 KB · Views: 107
  • F154B59E-35ED-43D8-AEE3-B96EC697DBB2.jpeg
    F154B59E-35ED-43D8-AEE3-B96EC697DBB2.jpeg
    375 KB · Views: 120
  • 97A2130B-F170-4107-8DA1-8B5CD914A5CB.jpeg
    97A2130B-F170-4107-8DA1-8B5CD914A5CB.jpeg
    294.8 KB · Views: 111

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.

Ask a Question

Members online

No members online now.

Forum statistics

Threads
31,522
Messages
518,269
Members
13,742
Latest member
Noodlebrain

Latest Threads

Top