These fish shouldnt even be available in the hobby... My buddy has one is a 17,000 gallon tank along with 3 blacktips. Its HUGE and still a baby. I have a feeling the sharks may end up dead in the future and even at 17,000 gallons, I dont think this is big enough for a fish that can easily top over 1000lbs.
Bumble Bee (Giant) Grouper Epinephelus (Promicrops) lanceolatus Serranidae
A cautionary warning is needed for this species. Juveniles of this species are a very attractive black and yellow color. As they mature, the coloration changes to mottled brown as they reach their adult size of over 8 feet long! Years ago, these fish were rare enough that aquarists rarely came across them, and when they did, the price was very high. This kept these fish out of the hands of people unprepared to care for them properly. Recently, tank-raised bumble bee groupers have become available at a lower price potentially creating a flood of giant groupers needing larger homes in future years.