Needing opinions please

[Matthewdavis14222]

A little background. This was a royal gramma that passed two days after this picture. On day Three we had to go out of town and had a friend coming by to feed the fish. So 5 days later he stopped by and feed the fish and everything seemed good fish happy and eating well .day 8 got the call that our two clownfish were dead but all the corals and invertebrates were good as well as my yellow watchman goby. Finger crossed I didn't pick up velvet from the royal gramma we ordered and didn't pt in the qt tank . Unfortunately this was a stupid mistake on my behalf thanks in advance for any help and advice

 

[Ben.QLD2]

Almost anything is possible with those brief facts. Can't tell anything with that photo either, aside from the m possible blotches. What are the water parameters? Is the goby the only remaining fish?

If so, I would catch it and put it in the QT and run a fallow period on the DT.