Bumping this up for you
Could you please place a better pic. Is the fish in the back a reflection of the same fish or is it a different one. Doesn't look very healthy !!
Back fish is different it passed away the day after posting picture
Can you tell us more about your tank? Parameters, tank size, current stock?
Pleco and Cory catfish 120
120 gallon tank with a single cory, pleco (what kind?) And a goldfish? Parameters? (Ph, ammonia, nitrIte and nitrAte)
gold spot pleco l001 dont know never tested water
You should get a liquid test kit, as it will not only help us help you, but you need to know whats going on witg your tank.. How often do you do water changes? Do you know the Nitrogen Cycle?
One a week I change the water