Plecos acting very weird?

Benjamin Sow

New member
I have 3 small plecos now, one is 7.5cm, 8.5cm, and largest of all 9cm. This problem started about two weeks ago when they stopped eating normally. I would add a slice of cucumber everyday and they will turn the slice into skin under 24hours. But now they eat slowly, they finish one slice of cucumber in two days! Then last week I noticed something wrong with the 8.5 and 9cm one. They often swim up poking their nose above the water surface. Since then the two of them always stay up there. Then yesterday the 8.5cm one died so I am worried. And one last bit, I also noticed small white spots(like scratches) at the joint of their pectoral fin. Is there anything wrong? They are not stressed as they're colours are very black. And they are not going up for air. The 9cm one now rarely eats cucumbers, he likes fish foods now, I don't know why. When I feed my fish, he will swim up and feast on the fish food. He rarely sucks on things too.

Help please? I don't want to lose my plecos.
 
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