Advice- 3.5" Powder blue Tang w/ 1.5" Regal Tang

[naesco]

No.
You attempting to justify the purchase of two tangs that require 6 foot tanks by buying tiny ones.
Picture a pie plate in your tank. That will be your regal soon.

If your LFS knows you have a 90 and is still trying to sell them to you, change LFS.

Thanks for asking before you buy.