I had a case of white spot recently which wiped out 99%of my cardinals, both my clown loachs, 5 of my platy fry, and my 2 beautiful black mollies.I now only have 1 adult platy, 1 cardinal, and 3 fry and was wondering about a change of water.I dont have a spare tank to keep them in while i do a complete clean of the tank...any suggestions.