My flowerhorn stop taking pellets. I fed him twice daily with alternatively okiko platinum and optimum quick red. When I give him pellets he take first 1-2 pellets but having some difficulty of chewing it. But after that he take the pellet in mouth and then throw the pellet from mouth. Yesterday I noticed stringy white poop and I think he got hexa or any internal parasite. But today the faeces looks normal red but circuitous. I think I should deworm him. I dont have Epsom salt right now so can I apply rock salt? I will use metrogyl or flagyl tablets. Want to know which method is more effective and safe - oral method where we make a mixture and inject into fish gut by a syringe or put the mixture in tank?