My tank is a 21 gallon. (odd euro size). My fish stock are as shown below. I change approx. 40 percent every Thursday. Before my change last thurday temp was 77, ph 7.4, ammonia 0, nitrite .1. I don't have a test kit for nitrates. Today temp is 80 because I turned air conditioning off two days ago when it was a bit cooler, ammonia 0, nitrite .3.
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