The tusk and grouper can easily stay in a 135, IMHO. But, I believe a 135 with all those is a bit overstocked. Take out one of the larger fish (puffer, grouper, tusk) and the three should do fine. Bo
You could possibly keep all them in a 135, but they would be a little cramped, and more likely to fight amongst themselves. How much larger can you go? A 150 would probably suffice, the larger the better though. Bo