FishyJames Posted October 31, 2022 Share Posted October 31, 2022 I have a 29 gallon with an under gravel filter with about 3 inches of substrate. (Eco complete)My nitrates have been real high.....off the ati chart. I have done 2 60% water changes and vacuumed the gravel and got the nitrates down a little. The tank is planted and I don't add fertilizer due to the high nitrates. Is there anything else I can do besides more gravel vacuuming and water changes? Should I still fertilize with a already high nitrate? Ps. My albino cories like the water changes....eggs everywhere with at least one baby bouncing around the bottom. Link to comment Share on other sites More sharing options...
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