Tril I have a 6' 180G tank. Originally I used flexible pipe but had to change to rigid because of the flexibility of the pipe. I used 1 1/2” flexible clear PVC and I found that as the water ran through the pipe it kinda moved. It also slumped along the 6’ length and the movement and slumping eventually caused the pipe to come off the barbed fittings. Under my tank I have a refugium and a sump and I to fully support the flexible pipe to keep it out of these two tanks and it seemed always in the way. The other side of the tank, with the 18” run was fine.
I changed to 2” pipe and did not glue some of the elbows in case I have to change anything. Instead of gluing I cleaned the joints, seated them very well and gave them a wrap of electrical tape. I also added some supports to make sure the pipe can’t move. This has worked well so far.
ross
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