That sounds normal to me. When the ricordias have their mouth gaping, or start bleaching or shriveled with normal lights on, then you might have to look into it. But what you describe sounds like how my ricordeas act in my tank. My biggest yuma expands to like 4-5" during the day.
And the only real way to know if it is acclimated is to actually do a good acclimation before you put it into the tank.