Well one... it wouldn't be able to stay in there very long..... and two, are the cichlids of equal size and can they keep up in the growth.... I would only do it if you had a bigger tank in mind and the cichlids will keep up....
All types of pbass will outgrow a 38 fairly quickly, but if you will have a bigger tank soon, and it is about the same size as your other cichlids, then it should probably be fine for awhile.