I have many species of loach together in the same tank.
I have had no problems whatso ever with them; they play sleep and
act as a big loachy family, even the Tigers are no problem.
I do aggree that skunks are the ones to avoid
here is what I have together in my 72 gal tank
6x Botia almorhae, 2x Botia modesta 1x Botia hymenophysa,
4x Botia Angelicus, 4x Botia macracanthus,
5x Botia striata, 2x Botia rostrata, 3x Botia helodes & 2x Schistura mahnerti