depends on what you are planning on keeping. (coral-wise if any). if you are planning a fowlr
tank (no coral) 10-15x turnover would work. (360-540 gph
) 20-30x for softies (720-1,080gph) 40-50x for sps
) those numbers will vary from person to person, but its a good start. I personally, considering mines a 125, those numbers would be insanely higher.