IS bacterial infection reversible?

[Beastije]

One of the wild caught otos in the quarantine has obvious signs of bacterial infection. Is much darker, lying on side or on its back,...
I cant catch it, for that it is still too active, and it tries sucking on stuff but I think it doesnt hold with his sucker and sometimes falls down.

I dont want to put medicine in the tank and I cant catch it without stressing it way more. I did a 10% water change yesterday and today when I noticed it
Anything else I can do? I put a cucumber in the tank, 4 out of the 10 are on it

 

[GaryE]

We live in the Age of Bacteria, and there are more of them than we can imagine. Some infections can be defeated, some can't. We can barely tell which ones we're dealing with. But I have never had a fish come back from a serious one.

 

[DoubleDutch]

If the fish is allready on its back or side I'd say this is a serious one.

 

[Beastije]

Yeah it didnt make it