I've had my 28 gallon fresh water aquarium which I keep at 86 degrees for several months now. Up until recently, I only lost one aquarium frog and one guppy. I recently got a pleco algae eater because my tank had some algae built up. Up until I got the pleco, I had 4 guppies, 1 red wag platty, 1 raphael catfish, 3 diamond tetra's, one bala shark, and 2 glowfish. Then I added the pleco, 5 neon tetra's, and a ghost shrimp. Now my fish are dropping like flies!!!! I lost all my neon tetra's (they looked eaten at!!), 3 guppies, and one bala shark!!! Does anyone know the problem? I"m thinking maybe the pleco is eating them?