I am setting up an emergency hospital tank (55g) and I have 0.50 ammonia readings this morning. I put a atl. blue tang in for 1 day and it died (severe Ich). The tank is now testing 0.50 ammonia, but I also have Coppersafe in it, which is known to throw off ammonia test kits (I am using API). I have no filtration on it, as I read copper kills the bacteria so there is no point anyways. Before I QT my sailfin, how do I keep ammonia down?