Sorry this will be long winded,but i'm trying to provide as much info as possible to get the best answers for my case. Close to a year ago I used it for the first and only time ever for a cyano looking type stuff that started encrusting everything,it was hard and would "chip" off.It was not your everyday cyano,nor was it cyano colored coralline either as coralline does not grow over living tissue,this stuff plowed right over some zoas and other corals with ease. So with doing everything the best I could (0tds ro/di wc's,filter maint,gfo,carbon,etc.) and all params were in check.I decided to try chemiclean to see if it would help and it did,the tank looked great with one exception,it depleted my tank of O2 and I lost all but 2 fish,all inverts and quite a few corals in the process. After being so fustrated with following the instructions to the "T",that I wrote Mr.Boyd explaining my thoughts of his product.He called me back in person and we had a lengthy conversation as to why what happened happened.It seems the lack of dissolved oxygen came from using an 18" bubblewand,he said that the bubbles produced from them are too big and rise to fast to have enough contact time with the water to add enough dissolved oxygen to it and that I needed to use a wooden airstone that releases the "mist" of microbubbles,thus giving much longer contact time with the water for proper areation.Ok,I buy that. Now the problem- This devil cyano is back and spreading again,I already know from previously that more wc's,more flow,less feeding,gfo,UV,etc.,all the will not rid this stuff. I believe I have a rock that is leeching something as it's a different density then the rest of my rock,much heavier,no coralline grows on it (and my tank is loaded with coralline),plus it's the first place the devil cyano showed up again,so something is different about it and it will be getting removed. So now i'm back to considering using chemiclean again to clean this mess up and nip it in the bud,but with a different strategy this time.Although I am literally scared to death and sick just thinking about it. I have two large air pumps with adjustable inline airvalves,two new wooden airstones.My plan is to use my bigger air pump with a tee to supply the 2 wooden stones,the other pump will still run the bubblewand (just for extra measure).All stones will be placed near the bottom with suction cups holding them.I also will take the cup off my skimmer (Remora) and leave running so that way it will still have the air injection but no skimming.I shut the skimmer off as directed last time along with my canister filter,I will still shut off the canister. So my big question is-Do I have my bases covered for areation? I DO NOT want my o2 depleted again and I DO NOT want to lose any more livestock.Any feedback will be appreciated.I guess I want some reassurance from some of you guys/gals that have used it with sucess.