Went on a 2 week trip and while I was gone my skimmer line came off and tripped my power so no power at all. My dad came by and told me all my backup pump are running but was unable to get main power back. SO I had only PH going in the tank for about 4 days. I guess it could be wost but lost 4 large colonies and 6 -8 frags. Also it browned out my tank. Guess I have more room for the upcoming frags swap 
