We set up a tank 2 weeks ago and have put 5 assorted platys and 5 male guppys in it. The guppys are constantly attacking the platys, so they spend the whole time hiding behind a big stone decoration and won't come out. It's upsetting me and my other half won't let me give them away, just says 'tough, let them get on with it.' I don't think it's fair on the poor platys. Is it usual for guppys to attack platys? The pet store we bought tem at said they were compatible. If that's compatible, I dread to think what incompatible fish would be like.