ok so ive had this little 6 inch retic for about 2 months in my tank and was eating fine and then i added 2 more rays about the same size about 2 weeks ago.(not sure on species) but now my retic is acting weird. swimming upside down and swimming to the top and doing a nose dive straight into the sand kinda like crashing. The other two rays i added are fine and my retic was fine with them until now. anyone know what could be wrong? maybe my retic isnt getting along with the new ones?