290G Peninsula Tank

[mseepman]

I need advice on a plumbing issue. I just don't seem to be having much luck with plumbing lately so I think its better to ask what people think.

On my return, I divide the 2" line into a closed circuit 1" run that goes over my eurobrace. T's then push the water down through holes in the bracing at the far end from the overflow. I have put unions on both sides of these runs in case I need to remove them. Herein lies the dilemma....where the holes go down, I would like to glue in 90's with threaded ends so that my educators can screw in and help push the water back towards the overflow. If I glue these in, I will not be able to get the "loop" off via my unions anymore...in fact they will be permanent.
Is this the right thing to do? Any alternatives that make more sense?

Already tonight I over tightened the the threaded PVC into my blo-hole pump and cracked the union at the pump. Aaargh!