How to do a blackout?

[tyrophagus]

So I have some spirogyra. The plan is a blackout for 3 days, with a large water change each day and no ferts or CO2. The tanks covered in black bin bags.

Is that the way you do a complete black out?

 

[squiggley]

Usually do a water change, dose ferts, switch off co2 and blackout. Don't touch or look for 3 days. Large water change, dose ferts, switch on co2