Very simple sump system?

"Jon C" wrote in message
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"Tony K" wrote in message

I didn't realize that. This makes things more complicated, doesn't it

How about this change: http://jonnythan.com/sump2.gif

I'd suggest draining onto the filter/bio-media, than adding CO2 and pumping
back. That way, you take advantage of gravity for the filtering (rather than
loading the pump), and the sump is "clean", which means less muck in the
sump. BTW, why the air pump? If you need to, have a spray bar from the pump
return, but having an air pump is redundant, and certainly not desirable if
you are injecting CO2. From personal experience, with CO2 injection and good
lighting, the plants supersaturate the water with O2 anyway, so much so that
you get bubbling of O2 off the plants.

Cheers,
Poe