My green chromis is not looking right

When it was time to get fish I started with 2 green Chromis. 4 days later one died. Did not think much of it as I thought he got stuck in a filter or something and that is what hurt his side. The other one was fine. I replaced the dead one with the same thing, Green Chromis. Now this fish has the same problem. Is he getting beat up? I hope the pics help. The original green chromis that lived is doing fine as is the pajama cardinal. These are the only fish. The strange thing is that it looks exactly like what happened to the first. Same spot same side everything.
Thanks in advance for your help and inout.

 

Looks like an internal parasite. Do they ever have stringy poo? Possibly worms. Do you have any Praziquantel? hikari prazipro - Google Product Search

 

i was having the same thing happen. Never did figure it out.

here's my thread on this same problem

 

It is a common occurance. Not sure what causes it myself but would guess interspecies aggression.

Jack

 

I had this fish alone all by itself. Not sure about the LFS though... Although I do remember it did not have but a handful of tank mates.

 

INWALL75 >> My clownfish sometimes has stringy poo like about an inch just hanging there. It stays connected to him for several hours. What kind of parasite are you thinking??

 

There's a number of flukes, worms, etc. that are usually responsible for this. There can also be a number of bacterial infections that can cause this.

Praziquantel works well and so does putting Metron in their food. Seachem. Metronidazole

 

Looks like it has bashed itself or has been bashed; damaging its scales, if it starts off as a white patch and then turns red then it has probably got a slightly infected. You could try adding some melafix it will help with the wound and fight any infections and is reef safe.

 

Any flukes on the fish will cause the fish to scrape itself on decor and damage itself to try to remove the irritation.

 

Melafix will help clear up any wounds, if you have noticed any specks on the fish or the fish flicking against things then parasites are probably the root cause of the flicking.