Yeah, like you said on AIM-you don't have a protein skimmer, haven't done a water change, and dont know your water parameters!! All things you should do!! Not knowing your water parameters is a problem, and the brown algae and the coral not opening should be sending up a red flag!!!! Test your water for ph, ammonia, nitrite, and nitrate at the VERY LEAST. Do a water change! And ASAP buy a protein skimmer! If you don't act fast, you could lose your precious clowns!