Welcome to FishLore!* It sounds like a bacterial bloom.* When the good bacteria is gets disturbed and killed off by accident, it multiplies like mad to catch up to the demand in the tank.* A bacterial bloom is the only time you "see" the bacteria in your tank.* If her tank was cloudy all the time, she may not have had enough filtration in that tank.* What you look for, is the gallons per hour (
GPH) rating for each filter used.* Add them up, and see if you have rate of 10 times per tank size per hour if you are using
HOB (hang on back) or sponge filters, and 5 times the tank size per hour if using a
canister filter.* So for your tank, you want to have 550 gph going in that tank.* Some fish are bigger and messier than others, so this can also be a factor on your filtration, and how many fish you can have in your tank.* Please post what you have in there, and the FishLore members can help you further.*
P.S.* I have a sticky here in the beginners forum called "FishLore Articles for Beginners" to help you more with cycling and other issues with a new tank.* *
