I have a cuttlefish. You cant keep it with other fish, they are voracious predators. They are very difficult to get a hold of in most parts of the US. Esp., Sepia bandensis (which is what I have), that is the dwaf species that is 4'' full grown. Sepia officinalis is more common (although not common in the trade), but they grow to 16+'' so it makes them more difficult to care for.