i have a predator tank that became one out of soft heartedness.. anyhow they are right maintaining water is OMG miserable, i had corals in there but have since moved most to a diff tank. not because of being ate but because a coris wrasse won't quit playing football with them. i have learned to lower how often i feed them and how much. in order to keep the stats fairly stable. it was a tough road but worth it i love the tank and it is my husbands favorite.. inhabitants include: dwarf lion, puppy puffer, marine beta, red coris, mated hawkfish, red king damsel, 2 gold domino damsels, shrimp goby, lawnmower blenny, purple tang.