Thought I'd put my 2 cents in here. I have a monster case of Dino in my tank so I'm following advice from this thread and from other stuff that I've read. I killed all my lights for ...today is day 3....and tried to get my pH up to 8.6+. I checked it yesterday and it looked like it was at about 8.1 so I was kinda ticked. I dosed Kalk again and got it back up. I have been manually scrubbing the rocks, glass and power heads with a toothbrush then doing a 5-10 gallon water change (90G tank) every weekend so suck out some of the crap from the sandbed and water. We will see how it looks when I hit the lights again today but from what I can tell, my rocks look good as ever and there isnt crap building up on the powerheads anymore. I was thinking about leaving the lights off for 5 days but I know my corals are hating life and I like to see my fish so I'm gonna get em back in the light today.