hi everyone, new to this site, hope someone can help me. I am in the process of setting up a 300 gallon rubbermaid as a shark / ray tank, what would be a good pump for this, and how should I plumb this. I was thinking of making my returns 90 where they enter the vat, and in same direction, as to not only intrude into the tank area, but offer good even flow, much like a whirlpool. Any advice would be appreciated, thanks, Marc.