My hippo i just got is showing signs of some sort of parasite... It keeps rubbing up against things and flipping out.....then it goes back and starts to eat algae.....is this normal for a hippo.....or is it a parasite....what should i do... a freshwater dip??? i have an invert in the tank but my yellow tang and my coral beauty both had a parasite that made their color go away and gave the yellow tang sores last week...i did a freshwater dip on them and now they are fine....should i do it to the hippo? or is this normal behavior for a hippo...