Hi I just purchase this tunze osmolator 3155 from a person on reef central about three weeks ago. The first day it work, but have not since. He stated that it was just services from tunze. I tried cleaning the optical sensor in hot subbed water a few time, I also purchase a new pump thinking it may be the pump. Still not working. The pump light show on, on the controller only. I will like to send it in so someone at tunze can take a look at it.