yes about 8-9 hours is all I run it helps lessen its growback.
Your next ten years of reefing will be different than my first ten, mine were algae stress years from listening to the old ways in the books regarding algae control/you just saw the ability to force control over a tank, and pictured it for others.
the big deal concept is simple-->
disallowance.
You could run your lights 24x7 and be bryopsis free is the point, working very hard to remove it lol, but it used to be the claim that if you don't detail manage po4 you'll have algae problems. or lights on too long. or heat too high. or overfeeding once and you pay for it with 9 mos of algae problems, all those variables have nothing to do with whether algae is in your tank, they just cause it...we have the final say even after causatives on whether our rocks look great, or green. Causatives have nothing to do with someones algae wrecked pictures, that's caused by purposely allowing it because we are typically bound to our training, and that training says we must use preventers only, which is wrong.
purposely looking at it and leaving it in there is the direct cause of all algae problem tanks. when you control causative factors better, you wont need to chem cheat, but chem cheating just fixed your tank until balance is found and its no longer bad to simply command a tank into performance, telling it how many days until it complies/ consider the old way, you trail behind your reef for mos/yrs, awaiting slight changes to take effect. you make 1000 excuses to tank watchers why your rock looks like it does
OR
we just opt out. your tank viewers come over, it looks great, you tell them you are having an algae challenge and they wonder why you said that, they cant see any of it. Your challenge subsides when you find the balance and don't have to farm it out.
we are reversing the nature of algae as we see it, and that means you cant lose a tank to it. Im not saying you have to dump peroxide for every problem known either, I don't need it in my tank anymore for rock algae im immune to it... having burnt it out like you just did 4 yrs ago, over a few mos time. I still use a wet paper towel w peroxide to wipe the inside of my drained tank to clean the walls.
when I get lazy on water changes and feeding red cyano will develop, that's an invader too just like any other...but ill do full water changes and scrub it off the rocks and as long as I don't get lazy on wc thereafter it does not come back. it responds to nonchemical scrubbing because it doesn't have holdfasts, and I clean thorough not weakly.
here are 300+ tanks seeing algae a different way after 5 yrs running. look at my post on page 3, I gave 5 yr feedback to Reefmiser for having shown me the opt out way, which saved my tank and all my future tanks. Not every invasion responds to peroxide, we just made it harmless to attempt. The thread shows very few in 5 yrs who didn't comply
Then hop to page 30+ onward and skim the pics, they are just like yours. this thread was my transition from a farmer into a fixer
http://www.nano-reef.com/topic/268706-peroxide-saves-my-tank-with-pics-to-prove-it/page-3