33g Brackish

[Arget]

In a few months I'll be getting a 60g. I'll be consolidating two tanks, so I'll have two open tanks after they're cleaned. The larger of the two I'll move my Betta Sorority into, while the empty Betta tank will turn into a Brackish tank. The Brackish tank will have Sailfin Mollies for sure, but I'm having trouble finding out what else to put into it. It'll be my first Brackish tank, aside from salting Guppies with ich. The fish have to be Gobies, and I'd prefer that they get along with the Mollies. I've tried researching, but it's pretty confusing. I'd like for them to be biotope with the Mollies, but the only one that I know that's biotope with Mollies is the Dragonfish, and one fully grown Dragonfish needs something like a 300g tank. Preferably something that's been successfully bred in the aquarium trade, it's cheaper, more hardy, and more ecologically sound.