These can reach a foot in length. Mine love left over food. But, I think someone of my fish crew has murdered them all.I'll hijack my own thread. This guy was making nightly appearances, then stopped. I think he's about 8" or so. I asked my wife and son if we should try to catch it, but they both like it.
I had/have those. Fire gobies share a home with them. Great scavenger. Make sure to offer it a slice of food now and again to enjoy