sad maroon clown : (

[1337TANKHAX]

so i had my little 8 month old gold striped maroon clown in my 12 gal cube reef with a bicolor pseudochromis, and i had them together for three months with no problems. i usually feed them frozen mysis, but one weekend i had bought some marine flakes for them so it would be easy for my roommate to feed them while i was gone. i guess the pseudo didnt like the flakes as much as the real stuff, and he went after my clown. ever since, he had been super aggressive towards everything in my tank, even my hermits. so i took him back to my lfs, but heres where the problem lies. my maroon clown is paranoid still, and he will not leave the back corner of my tank. he swims there all day because thats where the pseudo chased him to. and now hes the only fish in the tank but hes too freaked out to swim anywhere else. What do i do?!?!!

thanks so much for any help,

Daryl