I wouldn't black out for an entire week, the most I would go would be 3 days. What you can do as a tactical strategy to help get ahead of the algae is physically remove as much as you can (scrub the rocks in a bucket of tank water outside the tank), then immediately do a 50% change, then black out for the 3 days. That should be aggresive enough to get you back on the right track.
If the algae dies in your tank, then the nutrients they have stored up will be released back into the water and start the whole cycle over again. That's the logic behind scrubbing them down outside the tank to get rid of the stored nutrients.
"If your wife ever asks how much something was for your tank, just tell her you got it on sale and you had to have it! She'll understand"