Well - I've already commented - many times about my thoughts on Nurse Sharks being available thru LFS. In short - I believe that they shouldn't be allowed. But the sad truth is that it is - all to often they are .
Still I believe that the Nurse is a slightly better choice for a private aquarist - than Blacktip or Whitetip Reefs. Basically because they(Nurse sharks) are less active.
It's my personal belief that in order to keep a single Blacktip or Whitetip Reef for life - you will need tank/pond that is at least 20-25 times greater than Blue Zoo Aquatics suggests (i.e. about 24,000 - 30,000 gallons).
And that misinformation from websites like Blue Zoo is a really Big problem for private aquarists.