Columbians are born in brackish and can go freshwater or brackish as juvies and but can BENIFIT from MORE salt as they grow although if kept in freshwater from juvie on up they can stay in fresh I've seen that done MANY TIMES
My exact thoughts ewurm, the catfish give it a freshwater look (yea i know there not fw catties but still) then its mixed with reef kinda fish like the clowns. Love it!