Not really -- a goby, a conch (make sure its reef safe!) and nassarius/cerith snails will help turn the sand bed, but they won't make the problem go away. The issue is that your tank is aging still, and will be for some time -- and on top of that, your flow is inadequate for your needs. Increase the flow before worrying about something that will eat it -- you need to do this anyway.
Edit: Cyano is not palatable to pretty much anything -- your chances of finding something that willfully consumes it are next to nil. Control is your only option -- and control is the key. You can never completely beat Cyanobacteria -- its not an algae, its a bacteria that is incredibly invasive and found in all walks of life -- not just aquariums.
-Justin
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