my fish

[Angelique]

Hi! I have 2 sucker mouth algae eaters. How can u determine the sex of this 2 fish?

 

[Doomhed]

well, for one you would have to know species...there are thousands of " sucker mouth algae eaters". if you post a photo on here we can identify it for you, as there are many of us that are absolute fish nuts who memorize the scientific names of our fishes

 

[littletankbigworld]

If you are unable to post a picture, PlanetCatfish • the online home of aquarium catfishes is a helpful resource. Also, could you tell us a little bit about your tank? (How big is it? How long has it been established? Is it cycled?)