under: peakock gudgeans, fw flounders, monsterfish, farowella (much better than common pleco),african butterfly, mudskippers, electric catfish, dragonfish, knives other than clowns and bg, high quality bettas, peacock bass, yoyo loach, gar, eartheaters,
over: any goldfish (just not a colldwater guy), khulis, pictus, columbiansharks, bullheads, blue dempseys
I'll come up with more...