Solution: Go ahead and use PVC, it's lighter and cheaper.
Problem: After washing and "fizzing off" the carbon there
still may be some black/gray residue coming out of the tubes.
Solution:
Take a garden hose (do this outside) and let the water flush through the tubes to help remove any residue. This also allows to test for leaks.
Problem: Don't have the right size "tap" for the male hose fitting hole in the end cap?
Solution: Use
a regular drill bit, stick connectors into snug holes and use JB Weld around the outside of holes and connectors to secure and seal. Let dry and cure over-night.
Problem: End caps leak using teflon tape?
Solution: Glue on all end caps.
Problem: After gluing end caps on, still get some leakage?
Solution:
Dab more PVC glue around outside seam of end caps.
Problem: Fish appear stressed for oxygen?
Solution:
Add a couple of airstones to help with vertical water movement in tank and aid in the oxygen/carbon dioxide gas exchange that takes place on the water surface.
Problem: Magnum filters the water well, but need more circulation and water movement in tank.
Solution:
Mount a powerhead (or two) on opposite end of tank from where the carbon tube outflow returns.
