Well, I went down and rescued the one I saw at Petco. He seems pretty healthy and took to my established tank pretty quick! He first went around all the live rock inspecting all the holes. He tried a couple out. He tried some ledges.. and settled in the hole in the big centerpiece live rock.
I was worried about the bully Clarkii at first because he started showing the blenny too much attention....BUT, when he got too friendly around the blenny's adopted home, he got chased off!! You could actually see that the Clarkii was totally taken aback by someone standing up to him! LOL! So, what I will probably do is leave the Bicolor in the 10 and move the Clarkii to the 29 when it cycles. The Bicolor has REALLY gotten attached to that center rock and is munching my hair algae like there is no tomorrow!