I agree with the above. AlgaeFix isn't necessarily a good idea. Most of those anti-algae chems have copper in them. The reason that copper works to get rid of algae is that it is death to pretty much anything with a simple biology. This means that plants, as well as inverts, die when exposed to anything more than really minute amounts of copper. Your coral, as well as most of the critters in the
live rock, may suffer from using an anti-algae chemical.
As Sgould said, finding and addressing the cause of the problem is a more permanent solution, anyway.