Originally Posted by
DJW
Sometimes I throw a few handfuls of biomedia into a tank just to keep it going until it is needed, and I thought thats what you were doing. I have read about reverse-flow undergravel filters where you use a pump instead of air, which makes sense as it would tend to keep food & turds from getting down into the recesses. Not giving you **** but it would be pretty easy to put a little pump on it and flip it around. Tempted?
A long time ago when UG filters were all the rage you could buy these kits that were a bunch of rigid perforated tubing with little elbows and unions. The idea was you cut the tubing to fit your tank and make a grid. I built one for a 90g tank but I had the tubing way too far apart, about 5 inches, and there were only two lift tubes in the back corners. I guess it worked but I killed plenty of fish... hardly ever changed any water.