Hey , I recently switched from t5 to led. Everything seemed to doing fine but then my LPS (Frogspawn) started to die and that was a couple weeks ago and now its completely gone (20+ heads) now both of my hammers are started to die as well. Does anyone have any suggestion on what to do? My SPS is doing fine, I normally do a water change once a week or every other week, also my Alk is 6.8 try to keep it at 7 and Cal is at 410. The LEDs are sb reef lights and they are 13in above the tank set for 8 hours a day and W are at 20% and B is at 50%.