That tank is much too small for the garras. I've kept a group of 6 in a 2x1' tank before and they did fine, but I wouldn't recommend it. Even then it was a species only tank and they were the only fish in there, it was also scape to their needs. The panda garra is a very peaceful garra compared to other species. They sometimes push each other and do quarrel where both fish dramatically change their colors. There is a lot of chasing amongst these fish. They do need lots of individual caves to get into. They are I would say semi-social. The spend time together and spend time defending the areas they have picked as their own. A lot of times there is social non aggressive behavior between them. They do IMO need live plants, wouldn't be fair without them since a number are wild caught. Mine are in a 4 foot tank currently. I also feel such a large active bottom dwelling fish is going to freak out the badis, which from my experience are very tiny and kinda timid things. Garras LOVE to shove their weight around. I also agree that the garras NEED a current that they can get into.
My garras back in the 2 foot tank. Very peaceful fish most of the time. If nothing they have gotten more spazy in the bigger community tank.
http

/www.youtube.com/watch?v=OGyxyTLEYn0