reef rig or just sump

[demon666]

when i filled mine for the first time i filled the tank all the way up first.... including the overflow.... then filled the sump to where i figured the water levels would be..... then i turned on the return pump..... i had to keep adding water till the water levels evened out to where i wanted them as the pump filled the return pipeing and the remainder of the tank to get that perfect turn over........