Are My Other Fish in Danger?

[kleach]

Flame angel had an open sore that appeared within one day and he went down pretty quickly. Lost his color, didn't eat for the day and by the end of the day he was wedged between 2 rocks upside down but still alive. I did what I though was best for him and euthanized him.

Now I'm afraid that there's something in the tank that might affect the other fish which are 2 black ice clowns and a royal gramma. They are eating like pigs and seem completely fine.

This particular tank that he was in is my QT tank, but the flames permanent residence since he liked to pick on my coral. He was alone for months until I added the other fish mentioned above and a swiss guard basslett. The swiss guard died within 2 weeks from what I though was starvation and after he died it looked like one of the other fish was picking at his body.

Here's a picture of the flame angel's open sore...are my other fish in danger? Has anyone seem this before?

 

[kleach]

I also forgot to mention that the tank is a 29 gallon bio cube with 20 gallons of water after rock displacement. I've been doing weekly 5 gallon water changes for the past few weeks after the introduction of the new fish. I tested my ammonia and it was at zero. Didn't have time to test anything else by I will when I get home.

I have ruby reef rally and melafix in the tank from yesterday in an effort to medicate and save the fish. Should I continue dosing the tank as a preventative measure for the other fish?

Any and all responses are appreciated.

Thanks

 

[Deinonych]

I would keep an eye on the other fish...fortunately they are in QT. Ditch the Melafix; it doesn't do anything except make your tank smell like tea. You *might* be dealing with either Brooklynella or Uronema, so the Ruby Reef Rally will treat for those parasites. Just be mindful that the formalin in that treatment can be hard on fish.