Awesome tank. To me I don't think anthing is wrong with the yellow tail damsel. And please if it is sick, just try to cure in stead of throwing it away.
ok thanks though
i think the fish are doing ok if it has been there for 6 days
there is no sign of ammonia poisoning
(i am saying this because they were added the day after i setup the tank
i did a test ammonia is pretty high 0.20
i want to lower it but don't know how with out buying addetives except changing water
so when the cycle ends i hope they survive