Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Well, yes, you did move the fish out of quarantine too soon. I leave them in there for a month PAST the time any needed medication has been cleared from the water.
Good you caught the Ich so fast.
Pale from dorsal fin to nose... no idea. It is a surface thing like something growing on the fish? Or does it seem to be deeper in like the flesh itself is discoloring?
Reddish on tail and ragged fin could easily be any of several (mostly) Gram negative bacteria that cause fin rot. Flavobacteria columnare is only one possible bacterium, but most are responsive to antibiotics that target Gram negative bacteria.
I would not treat the tank, especially not with any copper preparation.
You might double the water change frequency, and emphasize vacuuming the floor of the tank the best you can. If anything is lurking it will probably be among the organic matter that is turning into mulm.
If some disease does show up you can then target the medicine to treat whatever you can ID, rather than a shotgun approach that may not help, and will poison the tank.
Once you have treated with copper it seems to linger, making shrimp keeping impossible in that tank.