Check out my Oct 2020 Post on the previous page also, but a little more detail:
I can't say it's a sure fix, but this solved my Red Turf Algae (RTA) problem.
I was overrun by RTA. What started as a small "interesting" patch went on to cover most of my rock over a period of months. In my research on how to fight it, I ended up talking to Dr Jack Kent (founder/President of Kent Marine and the founder/CEO of Brightwell Aquatics/Continuum Aquatics. I had submitted several questions through the Brightwell Aquatics website asking about MicroBacter Clean and Razor products along with my contact information. Dr Kent actually took the time and personally called me. We had a 30+ minute discussion; understandably he wouldn't tell me all the company's "secret" details and he couldn't guarantee it specifically for Red Turf Algae (RTA). He explained how he thought it would work, and how he would use it. All that to say he recommended Brightwell Razor in conjunction with Brightwell MicroBacter Clean. He also suggested "painting" the algae affected areas with Razor with a brush directly on the algae if possible. It wasn't practical in my case, so to start with, I mixed the dose with some tank water and used a turkey baster with powerheads and return off so as to get the Razor good and on. While doing this, I ran filter socks (filled with red something) that I cleaned and changed out ever one or two days. I was also (and still do) running UV. Read the instructions for dosing and how long it takes, but I used the Razor and MB Clean regimen for about four weeks. I noticed it working at about the 7 day point. The RTA gradually receded and disappeared to almost nothing within 3 weeks, and at the 1 month point it was completely gone! I've stated before, I'm not a snake oil guy, but this stuff worked for me. I had no fish/coral mortalities or stresses. I have only used the Razor a few times since then, when I had some algae start to beat me. I still dose MicroBacter Clean weekly two years later as part of my regimen. I can definitely tell if I skip a week or two.
The way Dr Kent explained it to me was this: the Razor "loosens" the algae making it sort of slough off, and making it easier for the bacteria in the MB Clean do their thing. The MicroBacter Clean contains a "proprietary" mix of bacteria that don't replicate in the aquarium (unlike MicroBacter 7 bacteria which set up the Nitrogen Cycle), but while they are alive consume/fight/win against what we consider bad algaes and bacteria (red turf, cyano, diatoms, etc. (don't quote me on the specific varieties). Because they don't effectively replicate, I add the dose of MB Clean weekly to keep their numbers up.
All this is going on at the microscopic level in a virtual Bacteria and Algae Battle Royale, so it could be like the "Sea Monkeys" they used to sell in the comic books. They probably don't have castles and crowns, but what I can say, is this: it worked for me, and I'm a believer. As with most things, if you're overrun with RTA, it took a while to get there. It will take a while to get out. For me, there was no scrubbing or pulling. Run a filter sock(s) while you're dosing this if you can. Consider running UV, and maybe up your water change regimen for the time you're dosing Razor. Links to product description below, as well as a filtered photo of my tank from a couple months ago. I regret I didn't take "before" pictures, it was just so ugly... Imagine 80% of the rock covered in RTA, but now not a shred of that stuff in sight. Follow the recommended instructions for dosing amounts. Consider adding the recommended maintenance dose of MB Clean as part of your regimen after you win your battle.
I have also found that urchins will sometimes eat RTA off my powerheads and back glass if it develops at all.
Good luck!
http://www.brightwellaquatics.com/products/razor-marine.php
http://www.brightwellaquatics.com/products/microbacter-clean_t.php
