I have 4 nano's running right now although the 12g just crashed this week because of grape calurpa going sexual and I lost everything in the tank. I have a 10g, 24g and a 20g at work. I do 50% weekly water changes as none except the one at work have a skimmer. I always test my change water and add any additives to that to bring it to the levels that I want so never add anything directly to the tanks themselves.
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