Cyano in a macro algae display tank

I’m probably going to attempt a blackout. I can’t really vacuum out any cyano because whenever I try I start to suck up the macro as well.

My question is. How long will the macro survive the blackout? I’ve seen 3 days is pretty standard to get rid of cyano. But will my macros survive that?
 

HOW MUCH DOES A FISH’S FEEDING REQUIREMENTS AFFECT YOUR STOCKING DECISIONS?

  • A lot! - I avoid fish that require frequent or specialized feeding

    Votes: 7 23.3%
  • Quite a bit, but an automatic feeder can change my answer

    Votes: 5 16.7%
  • It depends on whether my nutrient export can handle it

    Votes: 5 16.7%
  • It depends on how badly I want the fish

    Votes: 10 33.3%
  • Not much. I’m willing to adjust my routine

    Votes: 7 23.3%
  • Not at all. Feeding demands don’t limit my stocking choices

    Votes: 5 16.7%
  • I usually learn about the demanding feeding schedule after buying the fish!

    Votes: 2 6.7%
  • I haven’t really considered this before

    Votes: 3 10.0%
  • Something else (see my comments in the thread)

    Votes: 0 0.0%
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