This may be an insane idea, but has anyone ever tried to drill a bulkhead into a running tank? The reason I ask is, I do not have a sump but I am seriously considering building one and I am not totally convinced on the hob
overflow idea yet. If I was able to seal the overflow chamber to the tank wall first, and siphon out the water,I would not loose any water through the hole once it was drilled. If you all think I am crazy please say so.
P.S. I did talk to a guy who appearently did this and it worked, so he says!