The right plant eating fish for my Nano?

[Harpo]

Just looking for the right fish for my tank. Doing the research but everything is coming up yellow tang... I feel this is wrong being I have a 28 gal nano HQI.

I Have Too much colpura growing in the the tank and am tired of pruning it. My tank is only 5mths old.

Any suggestions on a hardy and size acceptable fish or invertebrates?

Thanks for any help!!!