I always add feeders when i put new fish into my oscars tank it keeps everyone busy and the new guys get a chance to adjust, i just finished incorperating a GT into my O tank he was added with 20 rosey barbs all went very well.
2 oscars1blue acara 1 salmon cat,2 plecs , 1gold severum,2 geophagus red heads, 1 striped raphael cat , and now 1 Gt. have 2 left over rosey barbs lol.