White fungal spots on sailfin pleco- used aquarium salt in 500l tank looking for advice

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GermanFishKeeper

Feeder Fish
MFK Member
Oct 27, 2025
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Schleswig-Holstein
Hi everyone,
I have a 500 L freshwater tank with one sailfin pleco (Pterygoplichthys gibbiceps), several cuckoo catfish (Synodontis), and bristlenose plecos (Ancistrus).

Two days ago i bought a sailfin pleco from a friend who kept him 20years in a 200l tank, now after the transport the sailfin pleco developed thin, white, cotton-like streaks on its skin – looks like an early fungal infection.
Following advice from my local aquarium shop, I added 500 g of aquarium salt (≈ 1 g/L) to the tank.
The fish seem fine so far – normal activity, breathing, he doesn't eat.

I now plan to keep things calm, observe for two days, and then do a 50% water change to bring the salt level down to around 0.5 g/L.
If the fungus gets worse, I’ll consider treating with eSHa 2000 or Sera Mycopur, which are said to be catfish-safe.

Does this sound like a good plan?
Any experiences or tips with using salt or mild treatments for plecos would be greatly appreciated.
I just want to make sure I’m not stressing the fish too much.

Thanks a lot!
 
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