Hiu, this belongs in the aggressive forum, but i'm not sure how big they get but it's big, they grow large fast but if you have a large tank they wont grow as fast, if you have a smaller tank it will grow a lot faster.They prefer only meat, feed frozen mysis, brine, silverslides, etc. Also, you can feed them live occasionaly.I have a panther grouper that will only eat meaty foods, he never eats flake.