I'm not familiar with that particular product, but I am familiar with Chemiclean red slime remover, which is made by Boyd Enterprises. It's an effective product and it requires that the skimmer be inactive for 48-hours when you use it. Honestly, I would be concerned about discontinuing the skimmer for 5-days. 48-hours really is my comfortable limit. That doesn't mean that you can't do it safely for 5-days....the main concern, I'd think, is an increase in phosphates during the 5-days that could foster a micro-algae growth that can ultimately harm or even kill certain coral. I have seen that happen. So, if you do the 5-day thing, address that very issue by cutting back on the number of hours you have your lights on over the tank and feed somewhat less than you would normally. Also be sure that your water chemistry is in good shape when you start the treatment and have a good deal of flow in the reef also so detritus doesn't settle on any coral which would be a hospitable place for adventitious micro-algae. Using a turkey baster on coral like zoanthids and clavularia so detritus doesn't collect at the base of their polyps would be very helpful at any time but particularly during a period like 5-days when the skimmer isn't being used. If you take those measures, you may very well be just fine.
