Yup. U can keep a black tip in a 322 tank.but cannot move at all. Will u want that? Stress the poor thing. If u go read up. U will read that pple will advise the biggest possible tank for it. Like a 10ft by 8ft by 4ft for it. But even that size. Still got pple say too small. I'm actually considering a shark tank in the future. Probably in the range of 10ft by 4ft by 4ft. Of coz some pple will say it's too small
I'm currently housing them in a 2ft tank with Zoas. Peaceful fish 2X the Cuttle's size should be ok, but my bio load is already too high. Price usually around 20-ish, got them most recently from ML & CF in the past.