Hi Babeey,
Photos would be great. If you could provide some further detail too, that would give us something to work with - the more information we have, the better we can help you and Mario.
How long have you had Mario?
Does Mario have any tank mates?
Have you checked the water parameters for Ammonia, Nitrite and Nitrate?
What is the water temperature?
What does Mario's diet consist of?
Welcome to the forum! :happy: