Sounds like your friend with the red-tailed cats has a solid set up. Maybe, you could try to copy his.
I have also been contemplating the same type of idea for my three big tanks. I am looking to build 100+ gallon sump/refugium and keep it all "hidden" in the stand. I have no info on how much good it will do, but I know that many pond keepers utilize a eco set up and get great results.
If you get any further good information, post it here I and I am sure many others would be interested in your findings.
I have also been contemplating the same type of idea for my three big tanks. I am looking to build 100+ gallon sump/refugium and keep it all "hidden" in the stand. I have no info on how much good it will do, but I know that many pond keepers utilize a eco set up and get great results.
If you get any further good information, post it here I and I am sure many others would be interested in your findings.