An amazonian peaceful community would be nice, with a nice sand substrate and plants.. with natural looking pieces of slate and rocks, and coves.. with apistos, and pretty tetras.
Your bumblebee gobies are a brackish fish, and should be kept brackish IMO.. they thrive in the conditions that they require.. There are two species of bumblebee goby that are available in fish keeping.. both are best suited brackish... yet one will tolerate fresh water more so than the other, I have never actually studied what species we have come into NZ, no doubt the one that is more tolerant of freshwater conditions. Bumbleebee gobies are also nippy and grumpy, and rather territorial :lol:
You could however, go with a couple of nice bichir to grow up Just be careful what you have as tank mates, because most of the above they will mow down :lol:
Keep us posted on what you decide, revamps are exciting :lol: 8)