Just joined. We are moving and I just purchased a 125 gallon tank that is 24" deep. Plenty of room for some large predators to turn around. It will be a marine setup with a 55 gallon tank as the sump filter to handle the predators' fecal loads. Plan on a panther grouper, some triggers, damsels, a dragon wrasse, a porcupine puffer, and a rabbit fish for algae control. along with some spiny urchins. Will send pics when it is all set up.