Question about POO

Hey guys i just got home yesterday from college for spring break and this morning i wake up and throw some food in for my trimac. Hes acting fine and eating well but I look at him while he is taking a poo and his poo in the beginning is white and string then it just turns tho the normal brown solid. So i know this isnt normal and im wondering if it is an eternal parasite or something like that if anyone has had any problems with something like this? Thanks

-Jay

i feed him hikari cichlid staple, but from time to time I throw cucumber in with him for the pleco and im starting to think he eats it as well