Hey guys. I recently added a couple of fish to my 240 sa/ca tank. I noticed tonight that my fish fins appeared somewhat clamped and they were "shivering" and "scratching" against the driftwood. I tested my water parameters and they are great. A couple of my fish are lethargic with clamped fins and "scratching". I am not seeing white specks or anything. Any ideas on this one, and how to treat it? Thanks everyone.