Pleco with white parts on body

[Bubbles2901]

my Plecoptera has lots of white on him.
Any idea what this is please.
Many thanks

 

[fluttermoth]

Hi there, welcome to the forum.

'Plecoptera' is a kind of fly; the fish is plecostomus. Your fish isn't a plec, it's a synodontis.

How big is your tank, how long has it been set up and what fish do you have? Do you know if your water is hard or soft?

How long has the fish been like this? Does your heater have a guard on it?

Sorry for all the questions, but the more information we have, the better we can help

 

[Bubbles2901]

Sorry autocorrect called it a Plecoptera. I was sold it as a plec.
Tank is 250L. He's the only one in the in case he is diseased.
He's had it a while.
Water is hard.
Tank been set up 10 years.
Heater has a guard.

Thanks for your help.

 

[Demeter32]

That synodontis seems to have some sort of infection, possibly bacterial. He also looks pretty thin, usually a healthy syno will have a well rounded belly.

The first thing you can start with is doing a big water change(50%). I think it will be easier to treat him if you move him to a smaller tank (20gal would be perfect) but if you can't move him then that's fine too. I recommend treating him with a bacterial med, usually fungal meds will also treat for bacteria. I'd wait for a second opinion though, maybe someone can recommend a treatment plan.