I really love blennies and gobies also, I have a orange spotted watchman gobie, a dragon gobie, and I just got a Blue Spot Jawfish. I would recommend the scooter blenny, I found a little red scooter that is really cool looking. I love jawfishes too, but if you decide to get a blue spotted one be ready to get stressed out because every time mine acts strange in the littlest way I freak out because he cost so much. Also jawfishes are aggressive to other fish that look like them, but only if they come close to their hole. The dragon goby is a GREAT sand cleaner anda lot hardier than the gold head gobie. My watchman gobie doesn't do much other than sit on the sand but I have heard of you get a pistol shrimp they will live with them in the shrimps burrows. If you want to get a mandarin I have heard they are fine as long as there are no other mandarins with them, but make sure you have a VERY VERY VERY well established tank with a LOT of copepods, trust me I have already lost 2 mandarins and I will not get another one until my tank is at least a year old.