Patio pond, insulation?

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So I've decided to DIY a mini patio pond of maybe 75-100 gallons for the babies I'm keeping. I have all the materials already to make a wooden box, line it, etc. I'm thinking about putting some kind of insulation in between the outside and the liner to help in the cooler months. What should I use? Foam sheets? Something you'd use on a home?
 
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Fiberglass would most likely crush and be ineffective.

No amount of insulation on the sides of the pond will help given the fact that the entire surface is exposed if the cold temperature is prolonged. I suppose it could be effective at mitigating overnight dips.
 
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Do what bettasngoldfish suggests. It works. Shade the water with decorative, potted plants.
 
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First question is where are you how cold and for how long. A small pond of 75 gallons in new england is bond to freeze over unless you throw a lot of air at it or keep it heated
 
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I'm in lower Tennessee. It doesn't get very cold here. Like 3 months of cool weather usually 50s (Farenheit) may dip down below freezing a couple times but usually just overnight. Will be on my covered back porch.
 
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Are your babies goldfish? I have personally done what you are discussing and the biggest challenge is keeping good water quality as the fish grow. If they are goldfish, just be prepared to rehome a bunch of them as they mature.
 
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Yes they are goldfish. There are only 4 and one is very very small.
 
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Just curious, is your patio a raised deck or on-ground concrete/rock pad? Given where you live, I wouldn't worry about insulating the patio pond since you have goldfish and there is no need to heat the pond. Just make sure the surface does not completely freeze over and your fish will be fine. For those rare, really cold days you can use any number of methods to keep a hole if ice forms. Aeration, pond heater etc. The most difficult challenge is maintaining good water quality with four + 1/2 :) goldfish in 75 to 100 gallons of water.
 
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It's on a raised deck. I have a bubbler I can use if it does get freezy to keep it open. These guys are like the runts, they're all much smaller than their siblings so I'm hoping that will help on water quality for a while. But I also watch them much closer than the pond and I don't mind to treat it more like a tank doing water changes and stuff.
 
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That is nice you are caring for the fry. No doubt, they will enjoy the attention! Let us know if you need any help. Sounds like you are on a good track.
 
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