I have a pair of Kribs & a pair of Blue Rams in the same tank now for over 1 month now, so far no issues ..
: tank size 155 L, also in the tank 10 neons, 4 ottos, 2 Neon Dwarf Gouramis, 2 Golden Barbs, 2 Krib - Fry (2 months old), 3 Cory's
The the male krib is second largest in the tank behind the Gouramis.
Just wanted to share my experience, ........ not a expert