So I bought a 29 gallon tank and originally bought 4 tiger barbs and 4 rainbow shark and an algae eater. I tiger barb died. The rainbow shark chase each other but I haven't seen them fight yet. (I was told by the fish guy you could have more than 1 shark which I now know is not true.) so I bought more plants and hiding places for the fish so they could make their own territories. The Sharks still chase each other but not as much. But the tiger barbs were nipping each other so we bought 7 more to create a little school for them to stop that, and 2 angel fish, also under the advise of the fish guy. The angel who's still at it has had his top fin nips off quite a bit... Poor guy.. Well all but 4 of the tiger barbs have died, and 1 angel has died. So I guess I'm just wondering if someone can help me figure out what's going on, and why all my fish are dying? And also what type of fish I should really have in this tank to actually have a peaceful tank?