I bought to green chromis and placed them in a 10 gallon quarantine tank. I have a sponge filter witch I had in my sump for about a month. I watched a U tube video where the person said he treats the tank with cupramine as soon as he puts the fish in. Now I read the cupramine will kill the bacteria on the filter. I already dosed half the recommend dose. Did I mess up and should I only use if the fish show signs of ick or red velvet?