Cyno Treatment!!! Bad Idea??? HELP!!!

Well folks Ive been fighting the beatiful Cyno aka slime algae for the past few weeks that has been slowly introduced since buying a used RO with old filter and using it for top off and a few water changes b4 finding out it sat stagnant for a while with nasty water in it and most likely grew bacteria in it during that.  Tested ok on a TDS at first but after running it for a little bit it was at 15tds.
Im blaming that for the cause since I always used the boxed Sea Water for water changes before and never had an issue and since both tanks have it, thats the only link between the two. After many water changes and increased flow and less feedings and cutting light cycle it was slowly getting worse and worse untill I had to resort to chemical warefare.
Im now a bit nervous after reading horror stories of the Chemi Clean Red Slime Remover which I dosed as directed last night in both tanks. I read more good than bad... Actually 10 good to 1 bad, but I still have a terrible feeling after seeing my corals this morning. Not all but half of my sps are sucked in with no polyp extension and dull coloration. Im hoping the reason for that is the added airstone for areation since the chemical depletes all the oxygen and I know sps dont like micro bubbles for extended periods.
It says let treatment go for 48 hours then do 20% water change but after seeing my corals I panic and did a 40% today after 24 hours to dilute the water with chemical in it. I dont know if I over reacted and that was just normal and all will be fine or if my tank just didnt like it but dont want to risk it and really hope it has no lasting effects. The softy tank is fine after the 24 hours and looks like the cyno is going away fairly fast as Ive heard it will do but of course the tank with all the money and one I really care about is the one not looking good.
I wasnt sure if anybody has used this before and can chime in to whether I over reacted of if it was smart to abort the mission and do a big water change. Obviously its still in there even wit the big WC but not as much. I did the WC about 3 hours ago and even after that corals didnt seem to want to open up still so I hope they just need to adapt and adjust or if I need to get them out NOW and try to save them.
Please HELP and let me know what to do..... If it crashes everybody will know cuz there will be a tank for sale real soon....

 

I hear ya on the "band aid" thing and Im hoping my RO and maybe a little rookie over feeding which Ive cut back alot the last 4 weeks are the cause and once the slime is killed, ill never see it again. As far as killing the bacteria Im buying Turbo Start tomorrow to keep on hand which is a very concentrated live bacteria,( Im sure you kno that but other may not) to keep on hand to add if I see the slightest trace of Amm, Trite or Trate.

What my question was and what has me stumped is why the corals look so unhappy already? Would the areation and micro bubbles be pissing them off?

 

Cool will do.... Just went down and tested amm, nitrite and rate but didnt do phos which I think is the culprit. Silicates from that RO. Its reading 0 nitrates but between the chaeto and cyno that is still there, they are sucking it all up so prob giving me a false reading. Like you said I will check noon and night every day for the next week. They looked a bit better when I was just down there with moon lights on them. All my montis, superman, sunset and rainbows look great and all polyps are extended so thats a comforting sign from before the water change.

Ill keep my eye on things closly and hope for the best. I was getting ready to splurge on a vortec power head and upgrade my 175s to 250s in the next few weeks but I better get a media reactor and some GFO instead for now and get my water quality in check before I worry about the fancy schmansy luxury stuff. LOL. Back to the basics!

 

It's all over the rocks, coral and sand. Everywhere! On my powerheads and even the cords from the powerheads. Stuff is taking over. That's why I had to resort to chemicals. I was watching it slowly kill my coral.

 

Well after stressing out the last two nights that I was going to lose everything, I was pleasantly surprised this morning to my pieces of sps that looked like white skeletons having some polyp extention and looking better. I did that big water change and added turbo start last night to boost the good bacteria in theory the red slime remover killed it. Not sure if it made the difference but I think I might pull thru this and not lose anything. Will give an update in a few days but Its looking much better than 24 hours ago. Thanks for the replys guys