Stocking recommendations fijicube 22.4g AIO

[Schulks]

I am setting up a new aquarium to consolidate my 2 current nano aquariums. It is a fijicube 22.4g AIO. I'm just going to take the current rocks in both and move all the fish in at once. I have 2 clownfish (about 2"), a yellow watchman goby(2") and a rainford's goby(2.5"). The rainford's goby has not ate anything I put into the tank in 2 weeks so I am worried he won't do well in the new tank. I want to leave him in the current nano alone or return him. I don't think I want an algae eater in the new tank yet anyway.

So what fourth fish should I buy and actually run a proper qt on this time?

 

[Projects with Sam]

I have a little Green Banded Goby that is surprisingly sociable for being so small. You may want to consider some Chromis too.