Thanks Chris and Hoppy ... this was helpful.

Chris, I'm still playing with the EI dosage. It's a trial and error thing at this point for me. I actually increased my dosage last week, but it didn't seem to help.

Hoppy, I think you hit one of my problems exactly. I recently put a powerhead in my tank, but I probably had too much of a mess in there for it to help much. I'm realizing when I see pics of others' tanks that mine gets way overcrowded in some areas -- I definitely need more open areas. Those ozelot swords are probably going to have to go. I should not have put them in the middle of my tank because they take over the whole think just about ... and they really block flow. I really dislike the idea of removing them both, so maybe just one at first.