Just got back from a week's vacation. Had my bro feed my fish and maintain my 40gal reef. I get back and there is food everywhere as well as what appears to be diatoms, brown algae on the live sand and live rock. I have never seen this before, the live rock looks dead, has a rust color, and the sand has hair like red algae on it. I just want to know what I can do to better this situation, if it even is one. Thanks in advance.