White poop!!! Please Help!!"

[Mrs. Nicky]

I just noticed white poop coming from my beloved Red Devil! What medicine do I need to buy to treat this? Will he be ok if treated?

***125 GALLON: 1 Red Devil, 1 Jack Dempsey and 1 Green Terror.
60 GALLON: 1 Vieja Syn and 1 Flowerhorn.***