Interesting looking fish,perhaps the color has to do with mating or breeding.It was sold to me as a Stiphodon ornatus or freshwater rainbow goby. It’s not showing the colors that I found when I googled this species but it’s very close so, maybe it just hasn’t gotten into its full colors yet.
I read that, the 55 gallon he is in has plenty of wood in it that has good film. With anubias that the leaves have algae too.
But I have noticed when I feed my micro pellets of my veggietai this guy seems to come out and pick some off the floor. I wonder if they would eat algae wafers like some NLS algae max