I have one RTS in a 55 gallon tank, and he bullies everything in it, though he doesn't harm them very much-just the occasional ripped fin. I put in lots of planted areas (not live plants) and bought lots of rock for hiding places and a piece of driftwood, hoping that it would help with his territorial issues, but nothing worked. I finally have gotten a 29 gallon tank specifically to move him into. I'm amazed yours aren't warring already, though I've heard on some forums that there is considerable variance in temperament in sharks and perhaps you've just been lucky.
And I too have a golden CAE, whom I've owned for about six months and is already almost four inches long. He was very small when I got him, and I'm beginning to wonder exactly how big he is going to get! He mixed it up with the RTS continuously, so that I had to put a heater in the goldfish tank and move him in with them. Not an ideal solution, but it's working so far. Like you, I simply like CAEs, and had good luck with them before. He didn't offer to hurt anyone but the shark, and I might put him back in with the livebearers at some point.
Sounds like your cories aren't really dwarf-I've got six
habrosus, and they're TINY-I keep them with a pair of fancy guppies in a 10 gallon. They'd be a mouthful for anything else I own.
Short answer is, like the more experienced aquariasts here, it looks to me like you've got too much of a mixed bag to keep in one tank.
And just to make it fit on the loach forum, I'm appalled at the mental image of the pictus slurping down kuhlis like so many worms!
