Yesh. I have a dragon goby myself.
Shamefully, he's not in the best conditions he could be in. Right now he resides in a 10 gallon community, but he's only about 4 inches for the time being. Problem is, I can only do 1 tbsp of salt per 5 gallons or it'd kill the tetra's ect..
I totally got duped by a line on a webstie. They had so much accurate info on the dragon goby. Then it says, "they're so peaceful, they can be kept with neon tetra!" Sigh~ that line totally got me. Good thing is, the store didn't bother to keep it in salt water, so the change has actually helped him, and his golden sheen has become much more apparent
Now, i did do a lot more reasearch before and afterward.
Apparently, the site that says you can keep them with neon tetra thinks you can keep them with each other, and sure enough they look kinda peaceful.
But everywhere else I've read, unless you have a realllly big tank, your dragon gobys will end up skirmishing.
Now if you don't mind that, go for it.
But again, many sites say they perfer to be the sole bottomdweller, and that they dislike shings shaped like themselves. Due to their blindnessish, they may take it to be a threat, such as another one of themselves. And their teeth, when angered, can be deadly.... So yesh....
Just saying, I'd go for more peaceful tank mates if i was fully brackish. If i had it to do over again, I'd probably be doing a puffer, such as a dwarf. Probably not a figure 8... but if i found out they somehow wouldn't eat bumble bee gobies.... (which take mega extensive care. live foods only). And so on.
Oh yeah. And texas rocks. I live there too.
Also - while i bought the aquarium salt for the goby, i asked if aquarium salt would effect tetras at all. They said no. Meaning, they either didn't care about the goby being put in with tetra... or... they were just really stupid and not putting 2 and 2 together.