Last winter I has an ich infestation in my 110 gallon home aquarium, so I thought I would try using pond salt to help the fish out. The odd problem was I wound up causing the Fluval filter's bacteria to die off. I wound up crashing the aquarium since I introduced the salt too quickly into the system. What should have taken days, I did in a few hours and the biological filter did not like it. I lost many fish from this over a short period, and made matters worse.
I never had heard of this problem before, but the evidence in my tests said my filter did die off. Lots of water changing and re-starting the filter finally settled things down, but it was a mess.
So be careful with your salts and keep the level relatively consistent.
If you get ich again turn the heat up to 86 degrees and it will get rid of it... I used to have a pet and fish store
