yes clowns do get a little snappy, but i just make sure to spread out the food over the tank. i have kept loaches and cories successfully by doing this. start with flakes and then shrimp pellets, twice a day. the only fight ive had was between my two biggest clowns loaches, happend in the middle ofthe day so i dont think it was over food.
when clowns get bigger(4-5 inches) i think is when they need to be seperated from smaller cories and bottom feeders, because their size will give them an unfair advantage on the food supply.
if you got small cories and only got 1-3 you could eventually put them in your smaller tank once the loaches get too big, and if you dont get cories do get at least 2 more clowns. i find 5 a very nice school number to watch but its up to you
good luck brobro!