Scraping Manjanos off the rockwork is an effective solution that won't affect the reef tank adversely. Spending a few hours on this focused task will restore the aquarium back to a healthy state, and you'll feel vastly better thereafter because the difference will be remarkable. While there are other methods you could employ, this is simply one approach for you to consider. And it's essentially free!
Using an iPhone 4 in a floater box, you can see how the corals are doing
in my 400g reef. The tank is 6.5 months old in this video.
In May 2010, the bubble tip anemones (BTAs) in my 280g reef spawned. The smokey sperm clouded up the water making it hard to see. What amazed me was that the Rose BTA released a clutch of eggs on cue. This particular anemone was in the 20g satellite tank tied into the 280g system. Had the eggs and sperm settled out, I might have seen new anemones crop up in my system, but the filtration took it all out that night. It was amazing none-the-less.
While feeding the suncorals in my frag tank tonight, I noticed tiny eggs
near the surface. The dark green branching suncoral was spawning.
It's a lot of work moving a 400g glass aquarium into position on the waiting steel stand. Gathering up a group of friends for the occasion isn't easy either. Thanks to a lot of muscle, we were able to get it into place. Here's the raw, un-cut video of the process. I'm still sore thinking about it. We could have used two more helpers that evening.
Cooking live rock (not curing rock) is a process that rejuvenates used live rock safely and inexpensively