i bought 2 silver mollies friday night and they are soo stressed that one died this morning and my water quality is fine and i added a little bit of salt and i left the aquarium lights off and but the rest are fine and how can i prevent this much stress in the future when i want to add new fish? my other new molly is a little stressed and i keep them with platys, swordtails, danios and i bought two silver mollies but like i said the other one died. they have clamped fins and swim "in place" near the top of the water. i never had this happen before.
