sorry, but one word comes to mind, overstocked, not to mention you have the most docile of fish in with some of the most aggressive, seahorses should only be kept alone, and puffers can be terrors, no to mention the great tang debate, IMO, thye should only be kept in larger taks, 75+gallons, they need long tanks, sicne they are such active swimmers, thye need lots of play room(more than growing room)