This is the inside. I dislike the fact that I never built an internal overflow
This leads to poor surface skimming
The 1" PVC is the return, that leads to (3) 1/2" flex pipes 12" long w/nozzles
This is the completed external drain setup
Very easy to shut-off & disconnect
I made sure the pipes going up - for air - went above the aquarium edge to prevent any leaks/floods. The top of each PVC is capped & has a 1/8" (?) hole drilled for air. These are actually fairly noisy - due to the fact that I nver finished my stand & never enclosed these
I guess I knew I might be swapping for the 180g
When I swap I will enclose these & soundproof the enclosure as much as possible