Recently my flowerhorn has started spitting out any food that I give her (hikari gold pellets, freeze dried bloodworms and tropical flakes). She used to eat with no problem. I am afraid she may have hex or some other parasite/illness. Not acting different still rushes up to the glass when I walk up to the tank and acts hungry. Poop is brown but not sure if it qualifies as stringy. Fish isn't showing any noticeable symptoms. Water conditions should be fine i do weekly 25% water changes and test levels are normal. How do I tell if something is wrong?