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Re: Black stuff/anaerobic substrate
Unfortunately, I don't have an underground filter. I did consider the idea of
tearing up the tank to install one, though, after all this!
Are you using RFUG's in planted tanks? Any effect on deep-rooting plants?
<< The UG filter that you are using is very much like the RFUG's that I tout
for substrates. They work great. I wouldn't use them for 12 years if they
didn't<g>. I like them much better than cables and no flow methods.