So, I was given a damsel and some inverts from a family who didn't have the means to continue to care for it. It seems to swim very well, though it does prefer to hide, and show some signs of significant aggression. Since I got the fish last week I took some of the sand with some new sand that the owner gave me as well as the rock and threw it in my low boy aquarium and did an emergency set up with a few pieces of extra equipment I had. Water permeters are all stable, but the fish did go without a light on the aquarium until today. Today all the equipment to properly set up the aquarium came in. The fish is a full adult 3 striped damsel around 3.5 inches in length. I did notice that the water tested positive for trace amounts of chlorine (0.2)(then added prime to the tank) though the water I used tests at 0. I suspect the previous owner was using just tap water and it's leaching from the rocks. That being said and the history of said fish is complete, here is the issue, since I picked it up I've noticed that it's gill flap for lack of a better term seems transparent or flushed. Gills themselves do not look inflamed. I unfortunately I am at work and can't currently provide a photo. I suspect chemical burn or bacteria is causing this. So is there any product one would suggest for the whole tank without removing the rock and sand. He is the only thing really in the tank other than a couple collonista snails that magically migrated from my main tank to this (probably attach to some of the filter media). I've hear good things about microblift, just wanted some other perspectives.


