Hiya
It sounds like you have cottonwool fungus. It is treatable, but it may be too late for some of your remaining fish. I would do a partial water change and put some melafix in the water.
I wouldn't blame Animates for this, it could be that you have overcrowded your tank or your fish have some other cause of stress. If your tank hasn't been set up for long it may not have cycled properly yet, and you can lose alot of fish this way.
Anyway that is my recommendation, others might have some good ideas.
Cheers and hope you don't lose anymore fishies.