Sick dragon goby... please help.

[MyNameIsJoe]

I noticed that my dragon goby had an ulcer/injury of some sort on his side. I'm not too sure what this is. He is still eating and swimming around just fine. When I noticed the lesion, I transferred him to my HOB refugium so my other fish (2 saddleback clowns and a blue damsel) didnt harm him. I'm not sure if it's ich or if its from my clowns picking on him. I did witness my male clown strike/pick at him. Anybody know what this is? Oh yeah, he is only 1 month new to my aquarium. I know, sham shame on me..... I did not implement the quarantine process b4 adding him tno my display. I just barely read the details of that process a week ago. Hopefully these pics help ID the problem. Please help. Thnax....

[MyNameIsJoe]

Goby is even more sick today. His lesion is getting bigger. I dont have the means at the moment to set up a quarentine tank so I am gonna just throw him in a 5 gal bucket and treat him with nox-ich formula. I guess i'm getting desparate, but if I dont do anything and wait, he'll be dead 2 morrow. My other fish arent showing signs of any illness, so I am just gonna leave them for now. after this weekend i will set up a quarentine tank for the other fish just in case. here are updated pics of the sick goby. I'm still not 100% sure what it is, but if anybody has suggestions im all ears.

[MyNameIsJoe]

well.... 2 hours later, he is officially dead. Damn! from now on... new fish get quarantined for at least 8 weeks. we live.... we learn.....

[leebca]

Sorry to hear of the loss. Quarantine is always your best course.

The fast demise would seem to be a previous injury and a subsequent infection taking over. Unusual that nothing would have been visible when you got the fish. Did it jump out or otherwise suffer an injury that you're aware of while in your care?

No need to reply to these questions, just things to consider.