I have a 54g tank with 2 clown loaches , one common plec, 8 platys, 2 female dwarf blue gourami and 2 zebra danios. The clowns have been in the tank since Halloween, hence their names, Hocus and Pocus. The smaller of the two is the alpha and has been keeping the other one from coming out of the hidey areas too much, but this week I noticed bite marks on the meek one's tail. I wonder how to handle this , knowing I can't update the tank size yet and the common plec stays , I'm not sure I can fit another clown, and would that even help the situation,anyway? As you can see, I am stuck and don't know what to do , just ride it out and do nothing seems unfair. Any suggestions feesible to my situation? Any replies would be appreciated, I love these guys

*note-feedings are once daily
high quality flakes
Hikari vege tabs
twice a week -dry shrimp
once a week - chopped pcs of cooked shrimp
every other day- fresh veggies ,ie: zucchini, red pepper, brocalli , etc
water -all fine
filters-HOT magnum-hob , penguin/bio-wheel , two hydra-sponge filters