I bought a new albino cory cat a few days ago, and lately he has been very lethargic. not sure what is wrong so I decided to see what you guys think.
However just as I started typing this, he began to roll around on the sand floor and have a LOT of difficulty swimming - he is definitely sick. He is NOT coming up for air more often than usual, but when he does try to get some air, he flails back down to the ground and lands on his side. Definitely bad.
I put him in a quarantine tank but I don't know how to treat him. From the picture it looks like he's got fin rot on his dorsal fin? And/or a swibladder problem? He has been worsening quickly today, and he has trouble laying on his belly. He fell on his side again in the quarantine tank - I gently nudged him over and he landed on his belly again. He's laying still now. Only moves to get some air and to wink. His breathing speed is normal.
All other fish in my 10gal tank (including the other albino corys i bought with this one) seem healthy and active. Did a 25% water change before I added in the new ones. Water is treated with SeaChem Prime.
Oh yeah, and... I bought these new albino corys at Petsmart. The guy who "helped" me get these fish grabbed them with his hands and dropped them into the container. Not sure if that's what harmed this little guy, but it did irritate me. And he tried to tell me that corys are not schooling fish and can live alone. URgh...
Picture! There's a shrimp pellet next to him but he hasn't been eating today.