I don't think you're going to find anything that will eat cyanobacteria (while it's still active/alive anyway). But I just got overrun with this stuff not too long ago and I tried "blacking out" my tank and all the other advice you'll find online. Nothing worked until I just went with plain old erythromycin (antibiotic). That stuff killed it all dead almost instantly. It PROBABLY did a number on the beneficial bacteria in my tank too, but I didn't see an issue (it helps if you don't measure nitrates - it's all about plausiblie deniability, but I digress).
Granted, my tank wasn't stocked at the time so if the death of my beneficial bacteria sent my nitrates/nitrites skyrocketing . . . no one would have been there to experience it. But I didn't wait too long after the treatment and associated water changes before I threw some guppies and ghost shirmp (a/k/a guinea pigs) and they're all still in there today, so . . . I'm assuming the healthy bacteria bounced back fairly well. No new cyanobacteria though, which is nice.
Also, the ghost shrimp did eat the dead, grey cyanobacteria/leaf sludge things that were left after the antibiotic treatment with no visible ill effects to their health or digestion.
im going to head down to my fish shop and see if they can do me anything
