I will start this by saying that I am the only person that I have heard of this happening to. So the chances of everything being fine for you are probably pretty good. I just want it to be known that the possibility is there so use at your own risk.
A while back in my old 125g tank I had done a tear down and rebuild after an infestation of Majanos (that is a whole other thread). After the tank had been restarted for a couple months I had a pretty persistent bout of Red Slime otherwise known as Cyanobacteria. I finally got sick of it enough that I decided to use a Red Slime Remover. I will leave the brand unknown since I am not sure it was brand specific. I had never used chemicals on my tank before other than dosing Calcium and the occasional buffer. I never liked the idea, but I was really tired of the slime. So I followed the directions to a T. In fact, I slightly under-dosed to account for displaced water by rock. That evening the red slime was turning brown and looked to be dying as I went to bed. The next morning I walk into the living room to a white tank. It was so milky I couldn't see the back glass. I immediately turned the skimmer back on and did a 25g water change that I had already prepared. The skimmer went haywire but after backing it down as far as I could it started to skim. The skimmate was Kool-aid red. It filled the cup in about 1/2 an hour. I emptied it and it was full again in about an hour and a 1/2. Then after another cleaning it took about 3 more hours to fill up again although much less red. In the mean time the water change had helped to clear the water enough to see what was going on. All 3 of my clams were toast. All my Acros were shedding flesh, and all my Nassarius snails had surfaced and flipped and were dead. Strangely everything else seemed unaffected. I contacted the manufacturer and they didn't believe me at first, but after much questioning the owner finally decided to have me talk to the veterinarian on staff. I talked with him for almost 2 hours. What we finally came to a conclusion on was that I had some rare creature or bacteria or something in my tank that reacted to the chemical and released a toxin that was poisonous to only certain animals. The company made a half-hearted attempt at covering me for the $500+ of corals and clams I had lost. So moral of the story, there is no such thing as a reef safe chemical. There is always a risk when dosing a chemical to get rid of something. We know so little in the grand scheme of things when it comes to the ocean it would be impossible for a company to know for sure that their product wont harm every tank it is put into. So while it has worked for thousands of people very successfully, I will never use a chemical on my tank again.