I still think that you are looking for trouble in a tank that small. You can wait. Eventually, you will lose fish. Again, I suggest that you look at the cookie cutters and try something along those lines. If not, if you don't mind the cost of losing the fish, you can try it. But, according to what I know, and others here, you will have a bad experience. Crabbo are very aggressive also. Look also at the profiles to see what might work! We love our fish, because we are able to enjoy them, not because of losing them on a regular basis. There are always those who do something outside the box, but few and far between...for a reason!