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?
 

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IF EVERY OPTION HELD ROUGHLY THE SAME NUMBER OF GALLONS, WHICH TANK SHAPE WOULD YOU CHOOSE?

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