Wow...sumpoholics and their partitions always amaze me, especially when they sell their Escher-esque creations and the new owner has to puzzle out what the hell the first guy was thinking.
I especially love dumb touches like those two useless compartments
wednesday13
mentioned; partitions for partitons' sake.
I know I'd be jig-sawing all those things out in short order. And for sure it needs more connections between the two parts.
This has got to be one of my favourite threads ever on MFK. Terrific build, and amazing rate of progress. It's really making me yearn to try working with an acrylic tank. If only I were 20 years younger...and maybe single...
I've just got two questions.
First: Your worry about the inlets draining the tank...is that related to siphoning the water back in case the power goes out? If that's it, all you need to do is run the inlets right up to the top, and then back down to whatever level you wish them to be. Drill a little pinhole in each one at the elbow at the top, right at the water level. If the power dies, that hole will break the siphon as soon as the water level begins to drop.
Second (and much more important): Are you planning to build some kind of wall or partition (there's that word again...
) or other construction to protect those vertical standpipes from interference by the fish? One of the worst floods I ever experienced occurred in one of my very early tanks, a plywood job that had holes drilled in the bottom like yours for all the inlets and outlets. I used ABS pipe for the drains, and PVC for the returns. Worked great...for years...until some idiot big-assed fish decided that it needed to jam itself into the gap between a corner drain pipe and the wall of the tank. Once it got into that several-inch gap, right at the top, it was able to exert enough pressure on the pipe to crack the threaded connection at the bottom, and that wasn't fun. That was the last time I used bottom-drilled bulkheads, ever. Lesson learned.
Looking forward to further progress!