The most aggressive things in the tank are: A bn Pleco and ONE spotted danio. The loaches used to be quite a bit more cautious around the Pleco; but recently i've seen numerous face to face encounters between them, always ending in Mr. Plecostomoose doing his "get outta here!" body/fin slap, and the loach takes off.
Could Mr. P's bristles do this to a dojo's fins?
While the head adornments are soft, BN and other cats have spines, often in their pectoral and dorsal fins. Usually used for poking, not ripping. That quick action that you are interpreting as 'Get out of here' might involve some attack with the spines. BNs also have some nasty cheek spines, but I am not sure they would inflict the damage you describe.
Poor water quality, perhaps nitrates, but also long term medication can lead to fin damage, too.
There are different strains of Ich, and some seem to hang in there for a long time. It might be worth while separating the fish according to what treatment they are best able to handle, if that is an option.
A bare bottom tank with just a few cave-rocks and daily vacuuming can clear Ich with no medication.
Heat and salt are a good treatment, if the fish can handle high temperatures and salt. This would not be the treatment of choice for cool water fish like Dojos. Danios or Bristlenose Plecs.
Rid Ich seems a milder formulation of 2 medicines that work better together than separately, and can be dosed in a way that is generally pretty safe for these fish. Still, if the treatment is going on for a long time I do not know what the cumulative effect might be.
Happy fish keeping!
I wonder if it could be from the treatment of ich itself. I don't know, I guess we'll see, treatment is over now (for this bout). Anything to make the fins heal better? Melafix?
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