I had two female guppies and about 20 tiny fry in a 36 gallon tank. Filtered with snails and artificial plants. They were doing excellent this afternoon around 3. Ive had them for over 3 months no problems with the tank or them dying off. Then I get home about 9 and they are all dead as is every snail in the tank and all of the guppies turned completely white. I'm at a loss. I had so excitedly awaited the fry and they were about a month old with another batch on the way.