fishmom Posted June 23, 2021 Share Posted June 23, 2021 What might cause continued high nitrates in a tank that is heavily planted and gets regular water changes? I gravel vac regularly (every few weeks) and water change about 25% weekly. Nitrates out of the tap are 0. Heavily planted 10 gallon with only 3 guppies, snails, and shrimp. Has internal filter and sponge filter. Would not cleaning the filter often increase nitrates? I have a similar situation happening in one of my 29 gallon with platies, but not the my 3 other tanks. Link to comment Share on other sites More sharing options...
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