There are two species of bumblebee goby that look very similar. The way you can tell them apart is the one with solid unbroken black bands (that meet at the belly) can tolerate freshwater (Brachygobius xanthozona). While the other (Brachygobius nunus)*has broken black bands that can look like dots requires brackish water.
Mine was very hard to feed.. My BBG would only eat frozen bloodworms and brine shrimp. I'm sure live foods are great. Mine just wouldn't touch the flakes or micro pellets. When feeding the bloodworms, i had to make sure my BBG got some because the tetras and other fast eating fish would snatch up all the food before the BBG had a chance to eat.. They're generally finicky and slow eaters, so you have to baby them.
I had a slightly brackish tank with 6 of these guys and Molly's they all did really well I had to leave the tank behind when I slip with my ex and moved away. They were really cute and fun little guys to have I was quite obsessed with them tho I've noticed lately I'm drawn to little tiny fish n creatures. Mine used to eat frozen brine shrimp and blood worms.