String Algae

Discussion in 'Water Chemistry' started by jeffrey, Nov 13, 2016.

  1. jeffrey

    jeffrey

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    hi to all

    i have a pond - managed to keep water clear using a filter - but started to notice algae growing with side walls and also on water lily leaves and pots

    i did some research on the internet - and added an aerator and also other plants

    i also started to use anti string algae products - but stopped using this as was worried was harming water lily plants

    any advice on what can i do to get rid of this algae

    Jeff
     
    jeffrey, Nov 13, 2016
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  2. jeffrey

    MitchM

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    Can you tell us about your pond?
    Size, fish population, feeding regime, filter setup, any plants?

    You most likely have an accumulation of detritus/uneaten food that is not being removed and is now starting to break down and release phosphate into the water where the algae is now taking it up.

    .
     
    MitchM, Nov 13, 2016
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  3. jeffrey

    Lisak1

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    And remember - algae isn't the enemy. It's nature's way of keeping things in balance. In the case of a manmade pond, it's a clue that something may need addressing. I think of algae like a fever when you are sick - too many people want to treat the fever without finding out what's causing it. It's a symptom - not a disease.
     
    Lisak1, Nov 13, 2016
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  4. jeffrey

    moby

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    Do you have large amounts of string algae, enough that you could twirl a rough stick amongst and pull it out in clumps? That amount is very different from the slightly different filamentous algae that will grow attached to lily stems and other objects which is short and fine and is an excellent good source for overwintering fish.
    Whilst I'm not really certain if the two are the same thing, I personally don't think so, and I find the fine stuff is definitely more useful than harmful so I don't try to remove it. Occasionally I get the proper string algae in my waterfall but no where else. It's easy to remove by hoand or a stick. Adding chemicals may get rid of it, but it has to go somewhere, you then have the issue of dealing with dead algae or its byproducts and not all fish/plants are tolerant of chemicals, it depends on what you have.
     
    moby, Nov 13, 2016
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  5. jeffrey

    jeffrey

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    good morning

    thanks for your immediate replies - i'll gather the required information and let you know - will add some pics as well

    thanks once again for your assistance

    Jeff
     
    jeffrey, Nov 14, 2016
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  6. jeffrey

    Mmathis TurtleMommy

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    I'm going to remember that!
     
    Mmathis, Nov 14, 2016
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  7. jeffrey

    mgmine

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    Do a search for sodium percarbonate on this web site
     
    mgmine, Nov 16, 2016
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  8. jeffrey

    jeffrey

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    good morning

    the size of the pond is 277cm x 230cm - depth is 50cm
    fish population is about 70-100 goldfish
    feeding - once daily
    filter setup - have an oase 20000 pressure filter
    plants - various (see pic)

    let me know if you need further details - thanks once again for your assistance pond.jpg string algae.jpg
     
    jeffrey, Nov 17, 2016
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  9. jeffrey

    jeffrey

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    good morning

    dont have large amounts of string algae - but is visible with every item in pond such as rock and plants
    good morning

    dont seem to have large amounts - but visible with every plant,rock ,pot etc - -will this effect water lilies ? - worried that algae will block lilies / plant growth etc - also doesnt look nice in pond - i posted a 2 pics of pond and algae

    thanks once again

    Jeff
     
    jeffrey, Nov 17, 2016
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  10. jeffrey

    MitchM

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    Your pond looks like a fairly calm pond and could be getting a buildup of detritus in some nooks and crannies.
    Not all detritus is making it to the filter, so as the detritus breaks down it makes nutrients available for the algae.
    (The pond volume is about 850 us gallons, plus the waterfall feature.)
    A population of 70 - 100 fish is on the high side for a pond that size, so you will need to improve the filtration any way you can.
    I think your pond could benefit from a vacuuming of the bottom and an increase in water circulation.
    A reduction in the fish population will also help.
    The algae doesn't look all that bad now, but you don't want it to get out of hand.

    How long has the pond been running in it's present state?

    .
     
    MitchM, Nov 17, 2016
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  11. jeffrey

    sissy sissy

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    It must be fine algae or just cloudy water .It may be caused by a lack of aeration .I really don't care for those pressure filters .You have to back flush the a lot and when you open them they smell like a sewer most times .I had one on my smaller 1000 gallon pond and had to back flush it 5 or more times a week and it still smelled bad when I opened it up .Also what size is your pump
     
    sissy, Nov 17, 2016
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  12. jeffrey

    moby

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    As I suspected, it's not string algae/blanket weed, it's the fine stuff that grows on pond items and will be a good source for your fish during the winter as I assume you have stopped feeding the fish some time ago?
    I have a one year old pressure filter and I'm very pleased with it. It replaced a box filter that was more trouble than it was worth. It's cleaned once a week during summer and is keeping my fully stocked mixed fish pond crystal clear, cleaning takes 15 mins and is a clean operation as opposed to washing pads thick with gloopy fish crud!
    I admit to having a fuzz of this type of algae on some surfaces of my pond, I personally don't mind it as I see the fish eating it and I don't think it impedes water lily growth as it only grows on the stalks.
     
    moby, Nov 17, 2016
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  13. jeffrey

    budgenator

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    It looks more like an annoyance than a problem to me, put some limestone of crushed oyster shell if your kH is low and maybe some gypsum (plaster) or some calcium chloride if your gH is low and that'll help leach out some excess phosphorous, do some 10% water changes in addition to the general cleaning other recommended.
    You have a really nice pond, small changes and patience should do it.
     
    budgenator, Nov 23, 2016
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  14. jeffrey

    jeffrey

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    thanks for all the suggestions - i'll try to lower fish population

    thanks once again

    Jeff
     
    jeffrey, Nov 24, 2016
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  15. jeffrey

    sissy sissy

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    I always keep bags of crushed oyster shells in my pond and think a lot of others do also
     
    sissy, Nov 24, 2016
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  16. jeffrey

    jeffrey

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    how is crushed oyster shells useful - does it lower the growth rate of algae? and is it just scattered at the bottom of the pond ?

    im trying to locate someone who sells this online as i dont think its available in my country

    thanks once again

    Jeff
     
    jeffrey, Nov 25, 2016
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  17. jeffrey

    addy1 water gardener / gold fish and shubunkins Moderator

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    My well water is very soft and acidic, ph of 5.4 or so. I use the oyster shells to buffer it up to a decent number. The well reading is below 30 with the shells it is slightly over 100. I add 100 lbs every spring into my bog. Where there is a lot of water flow. Also helps keep the ph at a nice 7.8 more or less.
    Feed stores carry it and call it oyster shells for chickens.
     
    addy1, Nov 25, 2016
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  18. jeffrey

    Lisak1

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    @addy1 Do the shells dissolve over time? Is that why you add more each year?
     
    Lisak1, Nov 26, 2016
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  19. jeffrey

    budgenator

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    The way I understand it the bacteria in the biofilter consume the carbonates in the water to build their cells, if there isn't enough carbonates the denitrification bacteria can't grow properly and ammonia and nitrites can build up and this can fertilize the algae.
    Calcium Carbonate is found in things like limestone, marble and crushed sea shells. We give crunched oyster shells to chickens with their feed (naqal tiġieġ)
     
    budgenator, Nov 30, 2016
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  20. jeffrey

    sissy sissy

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    I get mine at tractor supply but any farm stores sell them and yes they break down and I put mine in fine mesh bags 100_7400.JPG
     
    sissy, Nov 30, 2016
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