i wouldnt happily put them together. but i had considered the idea myself. i was going to go with a large group of tiger barbs, close to 10. plant heavily. and watch the tank closely. the larger ur group of barbs the more likely it should work out ok i think
edit: could u give more information on "spotted catfish"? there are a few that could have a name like that
edit2: actually, i just checked ur profile. in a 12uk gallon tank, no i would not do this. 12uk gallon is too small for rams, they need 80L minimum. the barbs would encounter them far too frequently in a 55L tank and the tank size also restricts the number of barbs considerably, making them more prone to fin nipping.