The answer is no. As someone who has kept both the oceanic black tip and blacktip reef sharks I would suggest nothing smaller than a 10' round pool for a 24" or smaller reef and that is the bare min. I have kept one in an 8 foot pool for a sort time but I do not recommend it nor would I do it again.
As far as size goes a black tip reef won't grow larger than 5' as far as I know but a oceanic can go 8'. The good thing that I have found with BTR's is that they tend to grow much slower that some of the other sharks out there ie. White tips and lemons.
Now for tank shape... Round is good but in my opinion oval is much better. The reason being is that a round pool doesn't lend its self all that well to a sharks swim glide pattern. In the round pool if the shark is too large or is one that tends to wall ride, the animal is always turing and following the radius of the pool never really getting time to rest before swimming under power agin. Round works fine for reef sharks because they don't have a long recovery period in their swim pattern but its much more critical for oceanic sharks. The long straight of an oval is great for the shark to rest in without having the obstructive right angles of a rectangle.
There are some other small stuff that would work in there like baby horns, bamboos, cats, and if you have experience maybe small hound sharks under 12" The thing you always have to remember when ever putting a shark in a display tank like this to always have a large back up tank and make sure it was acclimated in a larger system so it can settle down to captive life.
