Hi Kangster,
Here is the set-up: 30 gallon freshwater. Started out with 2 dolphin catfish (had them for 2 months in a smaller tank), 1 Upside Down Catfish, 1 Spotted Catfish, 1 Marbled Angelfish, 2 unknown (forgot what they are). They were fine until I added 3 new fish last week: 2 Clown...