Upside down catfish

Are these compatible with discus?

I was thinking about putting 4 of them with 10-12 discus and 50ish rummynose in a 6x2x2 tank

I've had one in my tank for years. Doesn't disturb the discus (is shy) and doesn't eat the cardinals. I previously had this cat in my tang tank, so the change in ph and temp seems to have done it no harm.