my 30g originally had one clown and a yellow watchman. the yellow watchman (from here on out referred to as "yellow fish", thats his name) was very happy, he would move around the whole tank between the rocks on the bottom. when i added a starry blenny, yellow fish seemed a little freeked out. the starry blenny("ziggy") never harrassed yellow fish, i dont know what the beeef was, but yellow fish stayed around one cave way over in the corner. unfortunately ziggy has passed. yellow fish is back to wandering around the length of the tank. now i am torn because we wanted to get another starry blenny. i am wondering if maybe a six line wrasse or some other dither fish would be better for yellow fish. any thoughts? am i overprotective of yellow fish? i never thought about his happiness when he was stuck in the corner because he seemed happy but now i see he is much happier. biff- your a scientist, can fish be happy?