[Calmia22]

Does anyone run a canister filter with UV? My congo puffer has a constant supply of new minnows in his tank at any given time. After dealing with a ick issue with him last week I am trying to find ways of reducing the chances. I still have no idea how he got sick since he wasn't stressed, all levels were good in his tank, and none of the minnows showed any signs of disease or death.

Anyways, this is a non-planted tank as well.