igalysh Posted October 16, 2021 Share Posted October 16, 2021 I have a question about filtering a 800 gallon stock tank. I have 5 goldfish and some minnows. I've researched filtration for ponds and all seem too large but those ponds have a lot of fish. I don't plan on adding more fish but do want to add more plants in the future. I bought an in pond filter that includes a UV light and that has kept the water clear but hasn't stopped the string algae and needs constant maintenance. I also had the largest CO-OP sponge filter with an airline. I was thinking with my low count of fish, I don't need such large filtration. With such a small number of fish for 800 gallons, would the largest CO-OP sponge filter and power head combo be enough? I think an air pump sponge filter wasn't circulating the water enough to get good filtration. I am also experimenting with the K1 media in the 2 liter soda bottle but am concerned that it won't circulate the water enough to filter well enough. I have two other tanks with sponge filters and upgraded them with power heads and the water in both tanks got very clear . Both tanks are planted with a few small fish. I was thinking of replicating the same with the stock tank. And this year with the 5 goldfish, my water lettuce stayed small. Do goldfish like to nibble on the roots? Any suggestions? Link to comment Share on other sites More sharing options...
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