Thanks, that helps a lot. They are in freshwater right now but I can slowly turn them over to brackish water without a problem. I'm aware of the saltwater clown goby (I'm more a saltwater keeper than freshwater), but there is a freshwater clown goby (Sicyopterus griseus)I did a quick search because this caught my interest. Looks like a rhinohorn goby(Found through another post on here).
Another quick search and I didn't find much info about it. It does look like it's a brackish water fish though, similar to bumble bee gobies.
Side note, clown gobies are a saltwater species.