I understand that the "Sea Hare" is the best green hair algea eater there is, but that it has a downside. The downside being that if it dies it will crash the tank. My current tank is 120gl., soon to be upgraded to 150gl., the sea hare I purchased is about 3 - 4 inches. Yes, I know I should have checked with you guys before I purchased it, the guy at FT insisted that it would be totally safe.