Due to my overflow being too small for a proper bean animal i have to customize it. Due you suggest doing an open bulkhead for main and standard curved pupe for open channel or reducing the 1.5 inch bulk heads down to 1 inch to be able to fit proper bean animal style? Also what are the risks of having an open bulkhead for main besides snails? Main will be plumbed into red reef matt 1200 so snails shouldnt be an issue.