I have Yellow labs in my 90 gal with a lot of things that shouldn't work but some how they aren't killing each other. I noticed my green cories all got killed off even with ample hiding spots, my Scwartzii cory's on the other hand have been doing really well. I think it also depends the order you put your fish into the tank. I had my Yellow labs in near last so they knew they weren't on home turf and had to play nice.
I have a pair of Keyholes cichlids that are doing really well with the yellows and clown loaches, black ghost knife, varied schools of tetras, a common pl*co, oh and vicious tiger barbs (that are for some reason docile in my 90 gal but weren't in my other tanks)
Good luck :thm: