Quote:
Originally Posted by GreenSpottedPuffer
II think in the end, a closed loop would have been the way to go. The tank is actually drilled for one and the intake is just capped but it would be a big deal I think to plumb it with the tank already full  Too risky for me anyways since the intake is on the bottom of the tank. |
I'm no tank builder, but could you build a small arcylic box to cover/seal the drilled intake from the inside of the tank (seal with epoxy)? This would allow you to work to uncap from the exterior of the tank and work on plumbing without draining as the box will act like an airlock in between the drilled part and the water. Once complete just remove the box (maybe cut away the epoxy??)
just my 2 cents...