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Originally Posted by emc7
40ppm Nitrate is safe for most freshwater fish. Discus and some wild-caught fish like it lower. But if you wait until 40 to change water, you end up with 50% water changes. 30% at 30ppm is easier. 20 is good target for a beginner tank. The fact that nitrate is suddenly climbing isn't a problem with the filter -- that would be indicated by nitrite, but it could indicate a problem with the plants -- they stopped removing nitrate, letting it climb. It doesn't explain the gourami's behavior or the bristlenose's death. That sounds like a separate issue. I don't see any nitrite test results, it would be prudent to get some, in case it is a filter issue. Plecos are sensitive to Nitrite.
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Whew - thanks. I started thinking I was doing something wrong. Mine run between 10-20 with nitrite and ammonia 0.
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55 Gallon
6 Green Sailfin Mollies
3 Dalmation Mollies
2 Black Sailfin Mollies
1 pregnant Platinum Lyretail Molly
1 Red Wag Swordtails
3 Mickey Mouse Swordtails
6 False Network Cories
1 Gold Spot Pleco (L001/L022)
3 Snails
20 Gallon
6 Black Widow Tetras
2 Red Eyed Tetras
6 Glass Catfish
9 Cherry Shrimp
1 Butterfly Pleco (L168)
2 Snails
10 Gallon
2 clown plecos (L104/L162)
25-30 Red Swordtail fry
35-40 Dalmation Molly fry
6 Platinum Molly fry
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