I built the stand for the 600ltr RDSB and the 600ltr cryptic zone that sits above it.
Where the RDSB will sit I added some 9mm rubber flooring. The original idea was that the RDSB was going to sit on the tiles so the rubber flooring was to eliminate as much heat transfer through to the tiles as possible. As it transpired the floor levels are different so the base of the vat had to be raised 6"
This pic shows the central heating pipes to the radiator plus the 32 mm waste pipe that circles the room.
The waste terminates at the drain and slightly slopes around the room.
Before installing the frag tank I placed polystyrene underneath and also installed the twin 54w ballast that will light the algae tank with 6500k underneath the frag tank.
This vat is 500ltrs and will be the return section. The large pipe is what I have come to call the "just in case pipe" I struggled to work out exactly the running height of the lower vats considering the surge tank. If there is a powercut when the surge has just fired there will be an extra 200-300 ltrs of water in the system, the mouth to the "just in case" pipe is the lowest point of the system so if need be the water will drain down through this to the floor drain.
The two 40mm bulkheads will feed the return pumps.
I will be using laguna pumps throughout the build. 2 x 16000lph returns and 4x16000lph closed loop pumps. I am a big fan of these pumps, to push 16k lph they use only 160w. They have the same motor block as the much desired red dragon pumps but only cost £160/$252.48 each.
The single downside is that once you remove them from the filter basket (intended for pond use) their base is curved so they dont sit easily when using them as an external pump.