Ahhhhh I think you guys are right! It made me think that though because only the top of the sps's branches were losing color not the bottom part or the top heads of my frogspawn. The part closest to the light.
Anyways I think I found the culprit.
I tested the tds of my ro and it was 17!!! Omg I guess my membrane is finally done cuz I replaced all the other filters like a week ago! Argh I'm so mad.
How bad is this? Going to replace the membrane today. Should I do a large water change after I make new water? How much should I do? My tank volume is roughly 40 g I think.
My Sps and lps were looking better today though sigh...