Tang Growth

[Magma]

I have a Yellow tang, Yellowed Eyed Kole, Hippo

Yellow has shown no growth other than getting fat (had him 3 months).
Hippo tang I got at maybe 2" and is now easily 4" (had him just over 3 months).
Kole Tang Has gotten fatter for sure but he hides anytime im near the tank so I dont see him much, but I dont think hes really grown much.

Interesting side note.

My 2 clown fish being moved from a 35gal to a 125gal have doubled in size in 4 months and show no signs of stopping.
My 6 line has grown quite a bit as well with the extra swim space.