i haven't been around recently enough so i've forgotten the general rules on filtration, but an easy way to get your overflows going (assuming you wanted to build your own) is to take some specs of a rated overflow, and then build yours to match it. This way you know the exact GPH of your overflow.
__________________ Josh Small Frys 120 Fish- 2 Percula Clowns, Hippo Tang, Flame Hawkfish, Black fin Shrimp Goby Coral- Green and Pink Frogspawn, Colt Coral, Zoanthids, Green Acropora, Fungia coral x2, Millipora Clams- 1-4.5" Crocea Clam, 1-6" Maxima Teardrop Cleaning Crew- 2 Skunk Cleaner Shrimp
2 Peppermint Shrimp ,20 Tiger Trochus, 5 Blue Legged Hermits RIP Victims of the massacre :  | 
