Thanks guys, I got him some API Tetracycline, he looks like he has inflamed gills from a bacterial infection. I also got a 2.5 gallon with filter for now. He seems to be doing a lot better. Half his body was white and is already returning to his pretty blue but his head still has black on it (the other side that's not shown in the picture). Hope the meds and tank improvement work! I will update in a couple days/week or so and let you know how he is doing.
-Gus: rescue-purple VT