Hi guys, I am new to the reef hobby. Sunday I noticed that my fire fish had ich, so the following Monday I set up my 20 gallon with a hang on filter, heater and air stone. I used the water from my display tank, used a couple pieces of LR and one of the sponges from the filter. I removed all my fish and placed them in there, this included the fire fish, 2 saddleback clown fish( had a couple white specs as well) , a bangai Cardinal and an orange spotted watchman goby. I let them get use to the transfer for a couple hours and then dosed the tank with half the recommended dosage of API super ick cure. I have used this medication previously in my freshwater tank and it worked great. Today the firefish and goby have died. The clowns look healthy and the cardinal is breathing a bit heavy and not moving around the tank too much. Do you think my fish are having trouble with the medication or is it the ich that is killing them? My water parameters are spot on. Maybe I was too late in noticing the ich? I did not think it could kill a fish in a few days?