[kaptken]

That is cool. I have always wanted to do that. a fish habit trail. but if it springs a little vacuum leak anywhere along the trail, or a powerhead blows a lot of air bubbles up there, all that water will drain down to overflow the tanks. I hope he has a really big sump somewhere to hold all that water. I think i would use acrylic pipe instead. stronger and less likely to break at a glue seam.