Bazza57
Fish Fanatic
Its only a possibility, but its for the sump, I know there are 'over the edge' systems I can rig together but these dont look at clean as the drilled overflow.
I have watched a few youtube videos and read a few guides and it seems simple enough to drill them myself, save me spending extra on the builds (If I get the tanks built) plus it also something else I will learn to do.
It's just a long shot - but have you considered searching the web or magazines for fish farm set-ups? Over the years I am sure I have seen (mainly abroad) tropical fish farms which have multiple banks of tanks. Just occassionally, you can see their piping layout. I'm talking about old fish mag articles here, but someone must have pictures/diagrams of working systems. Practical fishkeeping used to feature different LFS each edition, sometimes showing back of shop layout. Worth a search? I've just done a web search for "fishfarm filtration" & was quite surprised at the results I got back - cost wise, it is still cheaper to use plastic plumbing, but use the same ideas/piping layouts from production sytems