Thank Miagi> I would have build an overflow weir. When I get my new tank (comming very soon 2 months)
It will have a interal weir with a durso pipe on it. At the moment its fine, had one Turbo find its way to the sump and one that got caught in the hole witch nealy overflowed to tank! but I was home at the time, Thank god. I've now put on a elbow and pointed it toward the side of the tank witch leaves about 1/2" gap, too small for the turbos now.