They are similar to a wrasse in swimming but a bit less active. Mine stays in the far right 30 gallons of my 90 at all times. It doesn't swim in open water much, mainly darting in and out of caves and tunnels.
I will say moderately active.
I rate mine an 8. This is based on the beautiful bright yellow color, and it's amazing swimming style. These fish swim vertical, horizontal, diagonal, upside down. It's really a fun fish to watch.
Captive bred is the only way to go if you have the option IMHO.