so 12" wide you could go with 6" fish for best results, but 8"-9" would work since the tank is 96" long and the limited turning is mitigated somewhat by the length.
however only being 4" high really limits your choices...
so 12" wide you could go with 6" fish for best results, but 8"-9" would work since the tank is 96" long and the limited turning is mitigated somewhat by the length.
however only being 4" high really limits your choices...