I looked up a fish forum, and got the worst responses ever to a question I have. First, the situation. I got my niece a betta for her birthday. Instead of putting it in it's own little tank, she dumps it into MY aquarium. I had three angelfish in there, a clown loach, and some minnows leftover from when I set it up. Her betta apparently introduced a disease because it looked like it grew a fungus, and died. Then a few days later, my three angelfish also died. The minnows and clown loach survived and still show no signs of illness. I sent my sister to the store to get a lot of treatments for the tank before I put any new fish in there. I wanted to make sure EVERYTHING was wiped out. I couldn't simply empty the tank and clean it, because I still had the clown loach and minnows in there. Instead of the medication, (well, she did actually get it) she comes back with another male betta, a FEMALE betta, two angelfish and a clown pleco (stays only 4" long). And the medication she got needs to be used for FIVE consecutive days, and she only got enough for four. Having nothing to quarantine them in while I treated the tank for five days, I had to acclimate them and put them in my regular aquarium after all. I ALSO put the medication in the water, hoping it would kill the disease anyway. I posted this to a fish forum, and I got responses of "you're going to start a new cycle on your tank! It will kill your fish!" and "Take those fish back to the store and get what YOU want!" Yeah, helpful.... (NOT). It's really the same number of fish when you consider that the new ones are much smaller than mine were, and the only addition is a female betta and clown pleco. And it has only been about a week, so I doubt it will actually need to cycle through the set-up all over again. Not only that, but these fish have been released into my tank, so the store doesn't want them back. They'll give me a refund if they are dead, but they don't want living fish back because it might introduce diseases into THEIR system. All I wanted to know, and all I asked, was if they thought I could successfully treat this disease with a wide-spectrum treatment in only FOUR days. Unfortunately, I got answers to things I already knew I couldn't do. Does anyone have experience with this? Do you know if this will be sufficient treatment if the new incoming fish were healthy?