So, I'm planning out a South American tank and would like to do an oscar and a couple other SA cichlids (thinking acara and severums). I'd like to add a catfish, but want to try and keep it South American, and I'm running out of ideas for SA cats that aren't either too small to risk (like pictus) or way to large for me to handle (like RTC). I haven't gotten the tank yet, it'll be to fit what I decide, but I won't be going over 200 gallons more then likely. Any ideas?