blackout to kill cyanobacteria?

[Reef noob_]

ive be3en hearing that wrapping your tank in a blanket and shutting off the lights can help eliminate cyanobacteria in a reef tank, i have been thinking about trying this as i have had a bad cyano outbreak recently,but i have a few questions:

how long should i do it for?
does it harm corals?
does the die off create excessive ammonia?
is it worth trying

thanks in advance!

[AdamNC]

I've done it before just by shutting off the lights to the tank for 3 straight days. No ill effects to the corals but it came back about 3 weeks later. You need to get to the root of the problem first to find out why you are getting it. After changing my lights from PC to LEDs and a few water changes I haven't noticed any cyno return.

[thenewguy997]

It works

[whosurcaddie]

Here you go a step by step guide.
http://reefcentral.com/forums/showthread.php?t=2279039

[Reef noob_]

thanks!