Depending on what kind of bichir. I've never kept gars but im quite one can't live life in a 4'x2' footprint they need much larger. Especially since that gar can grow up to 3' a 24" tank wont work because they aren't flexible enough to turn around. and any other bichir except sengal and i think delhenzi can't live in the tank for life either. So if you're not planning to upgrade id say no gars and that one won't fit for life and may like 1 or two more sengals could work. and with decor i say sand is a must and some floating plants for the bichir to "nest" in they like to do that.