I'm not sure about the gph
rating. I'm kinda winging this. I planed on using a hob
Lee's specimine tank (large), as the overflow, and just modifying it. What determines the gph
rating, the size of the overflow, or the size of the hole in it? By the way, using the lee's tank is just an idea. I have'nt bought it yet, so if you have a better idea (that is in the same price range) please let me know.
Also, any thoughts on the undergravel, waterjet, water return idea?