cichlid-gal, thank you very much!
Betty's BN plecos are so cute, I'm so glad that they're doing well in my tanks. There's three of them in the 15 gallon tank. I figured they would be fine in a small tank for now, ehehe
There might be a chance that you've read
Lamental Jester's topic because he and I both have the same 15 gallon column tank, and we've been "competing" so to speak on who has the best one (mine being the far superior one, because it had pokemon decorations in it before! LOL!!) He also uses co2 in his tank, while mine does not.
As for the filter, I replaced the filter that came with this tank (It was an aqueon something or other HOB filter) with an Aquaclear 70 HOB Filter, and just placed a bunch of Seachem Bio-Matrix media in the filter instead of the foam block, and it seems to be doing very well at filtering and keeping ammonia/nitrites at 0, and nitrates at really low levels. The plants do a lot of the nitrate absorbing though, which is great!