Discus and other tank mates hit with worms!!!

[Joeysdiscus]

Anyone on aa got any experience with discus getting worms??? It's killed one of my discus and a clown loach but also four other discus have stopped eating for the past four days and getting skinnier each day also my African bush (my pride and joy) has now stopped eating last three days! I've just finished treating the tank for the second time with kesha hexamita worm treatment I'm hoping that will work but any other information or help will be greatly appreciated!