i had kept 4 bbgs with my 2 figure 8s in a brack tank and they did fine.they would sometimes steal the bloodworms form the puffers' mouths.you could also put in a "freshwater" flounder which are brackish,fig 8s, and chromids which are supposed to be pretty peaceful.thats why im gunna get some when i upgrade my brack community.it is also said that dragon fish(dragon eel/violet goby) will get along fine with bbgs but im not 100% sure id trust one not to eat a goby with a mouth 2 times the size of them filled with big teeth.