depends on the species of the acara.
if you are refering to "blue acaras".
they are not a very aggressive species. as for fish other then cichlids to put with them. i'd say just about anything that isn't to small. various tetra species, alot of barb species, assortment of rainbows, prolly even swordtails and like fish, angelfish(cichlid), firemouth(cichlid), smaller geo's(cichlid), cories, there is alot of stuff you could try.
if you are refering to dwarf acaras. you could keep much of the same as above with them. except the other cichlids listed. you could keep them with apistos as well.
what size is your tank?
if you are refering to a Green Terror, then you cannot put much as stated above. i would keep them with cichlids and other large fish, that they cannot eat.
there also is "port cichlid" which is also acara. they get nice size, but are still purty peacefull.
what acaras are you speaking of?
well hope this helps some. this info is from my past exp. take it as you wish.
however i am deffinatly no acara specialist.
