Hoplo are quite non-threatening catfish, I keep mine with midas and JD and have no problems. I also have a couple of corydorus that i expected to be eaten by now but they've somehow managed to co-exist.
By the way I had a pictus at about 3", the JD enjoyed eating it. I've heard since that catfish with long barbels cause a bit of grief and sleep disruption to some cichlids.
The tank I want a small cat in is my 30 gal with a hardcore red zebra a fisty ahli and a not so bad but can be yellow lab I plan to about summer of this year get a rent house I can do that with but my apt says I can only have one 20g and I just so happen to have fifteen with a 2 inch gt and a little smaller Texas which I'm about to give away so I can have tank room in my planned at least 55g and ilike cats but with tank sizes and my fiancé not so much for whiskers I just would like a smaller one