Originally Posted by
Soulwind
Well you're most likely already done with it, so this is moot, but ....
To actually use it as a fully functional res, I think I would use the bottom portion as a normal res with full inlet/outlet lines.
Then put a small submersible pump (heck one of the little aquarium pumps would be plenty) inside the volcano portion and just
run a tube into the 'res proper' portion. Just have the little pump doing nothing but supplying a flow internal to the volcano/res
and not the loop in general. That might generate too much turbulence or something, but I think it would work.