none. The smallest dat (Silver) gets upto 12-13" IIRC and I've seen some monster clown loaches that neighbor 12 inches as well. I wouldn't go with either unless I had a bigger tank to put them in when they got adult sized.
I would go with a simple, planted tank and a Rainbow Wolf (Ery. ery) possibly even two if you could get yourself a nicely drilled piece of plexiglass to separate them.