I just added 3 yoyo's to my tank last night. Today, the entire tank has had a personality shift! Before the yoyo's, the serpaes had a favorite hang out near the bottom on the right side of the tank. The angels always hung out near the surface on the right, and the rainbows seemed to hang in the middle of the water collumn on the left side of the tank. None of them ever really spent any time actually on the bottom of the tank. Today, it is like they have all seen the yoyo's savaging all over the bottom of the tank and wonder what these guys know that they don't! EVERYBODY is now roaming all over the bottom of the tank, sifting through the gravel and checking things out. Simple pleasures I guess, but these fish are really cracking me up.