I am having a lousy time with the fish from my daughter's tank. I got them cured of ich and back into their tank which is now cycled, but the edges of their fins are whitish and I believe it is fungal. When I was treating them for the ich, I only did 50% water changes daily in a 10 gal bin with airstone and I know that was that was enough. By the next morning the ammonia was around 0.25 ppm. If I have them in a 10 gallon bin and do 100% water changes each day, how do I medicate with the API Fungus Cure? The box directions are "1 packet then wait 48 hours, another packet and wait another 48 then 25% water change and replace carbon in filter." I have no filter in the bin and don't want to treat the main tank or all the filter beneficial bacterial will be wiped out, correct? I can't leave them in the bin four days without a water change and wonder how I can do this correctly.