I had some banjo catfish die of some fast moving fin rot. it was like their skin was peeling off. I had a large nitrite spike(possibly without ammonia spike) from some unknown cause. I have done two water changes and nitrite is now 0 and will not be spiking again. Problem is I have a bunch of clown loaches in their tank. They are currently sitting in 1tbs/5g of salt. No clown loach is currently visibly affected by fin rot. recommended treatment?