Sharks?

[Hustler]

I remember BAs wipeout... I was picking up gars the following day i think.
Im not looking to keep anything insane for sure... I know nurse sharks are way too big for even large home aquaria. Im just curious about the small species. I noticed alot of people keeping blueline triggers in smaller tanks with positive responses accross the board.... they get 24" and a 24"trigger would be what 12-14" tall and 6-8" thick weighing 20-30lbs where as a 3 foot catshark is 75% tail and at the most 3" in diameter weighing 2-6 lbs.... Im just missing the logic here a bit