Leonardo7689 said:In my experience with wrasses, they do sleep in a cocoon. But during lights on, they just leave them behind. My power heads normally takes care of it and just blow them off, or my snails just gobble it up as snacks. How much water flow do you have?
Leonardo7689 said:It's kinda hard to be certain of what it is without any pictures but I'm guessing it cyano. They start to spread out when there are lots of nutrients in the water. Too much light also aids to that and not enough water flow. Try leaving the lights off for 24 to 48 hours and see if they dissipate. In the event that they do, it's definitely cyano