7.5' length might be a bit short for a SA arowana in the long run. I'd go with cichlids like earth-eaters, uaru, hoplarchus, severum, mesonauta, etc a bunch of nice plecs, and perhaps some other bottom dwellers like pictus cats. Could also add something like chalceus, or pherhaps silver dollars though I've found they usually will nip the cichlids fins.
7.5' length might be a bit short for a SA arowana in the long run. I'd go with cichlids like earth-eaters, uaru, hoplarchus, severum, mesonauta, etc a bunch of nice plecs, and perhaps some other bottom dwellers like pictus cats. Could also add something like chalceus, or pherhaps silver dollars though I've found they usually will nip the cichlids fins.