They get around 15” obviously other things play a large part in that. Tank size, food, water quality etc, and Im speaking on experience. Also as far as bloat I never have any die from bloat and I feed my baby’s high protein pellets, flakes, bloodworms, krill, and raw shrimp from the market which they eat every day. I keep the temps and the tank in the higher 80s. IMO I think they die from being highly stressed.