id shark

Curious if I were to purchase 2 or 3 Iridescent Sharks at 6" how long they could last in a 96x30 tank with very high water flow? Reason for asking is I already have plans underway to build a 600 Gallon aquarium in my pet room [either 96x60x24 or 120x48x24 not sure which one yet] but it will not...