My fish is rubbing himself on the gravel

[little fry]

Hello i'm concern about my male Guppy. he tends to rub his left side on the gravel as if he is trying to scratch something is that side of illness, or what. and if so please give me a solution.
thank you,
leroy.

 

[littletankbigworld]

That is a sign of stress or illness. Can you please give me more information about your tank, such as how many gallons it is, how many fish you have, and the types of fish you have? How long have you had your tank? Is it finished cycling?

 

[stud_man50]

also has anything changed about him physically? are his gills redish? bumps? looks like salt was shook on him?

 

[nikcasper]

if its not sick, i know cichlids rub to establish territory or just to rub ich off their slime coat.