Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Set it all up without glue on the PVC. Hand tighten the slip fit fittings. They will hold long enough for a test. It may leak, but none of these are high enough pressure to actually fall apart. Maybe do this outdoors to be really safe.
Try adjusting the height of each elbow until the system is working for you. Then drain and dry it, and mark the pipes. Glue them.