I had the same exact algae and I was able to get rid of it. I'm pretty sure it's either brush or staghorn. It's definitely not beard algae
Mine started off light in color and eventually turned brown, then onto a red as it died off.
I did a number of things, it dying off was probably a combination of everything. What the heck, here's the rundown.
1. Flourish Excel (wonderful stuff if you dont' have pressurized CO2)
2. Flourish Potassium and eventually dry ferts
3. Cut my light cycle to 8 hours.
4. Plenty of CO2
5. Stopped dosing with micronutrients, I guess I dont' need them with the Flourite substrate. I am positive the excessive iron in my tank was the main cause of the algae explosion.
6. Did water changes every couple of days, kept nitrates within 10% of 20ppm at all times regardless of how inconvienant it was.
7. Just a note, I didn't dose with phosphates and I use RO water, so my phosphates probably hit 0 before the algae died off.
that's pretty much it. The stuff comes back when I don't use Flourish Excel or Potassium so it's probably just an imbalance. I'd imagine if any one of these fell out of whack the stuff would come back.
and i have like 5WPG on my tank.. Everyone said I was nuts but I didn't cut back on the amount of light, just the length of the light cycle.. my lighting setup is sort of inefficient anyways
Like I was told and found to be true. You need your plants outcompeting the algae. They won't do it if they don't have any CO2 or light. Cutting down on the lighting too much will help the algae grow in my opinion, I'd imagine they need less light than most plants do.
I can almost guarantee the leaf zone is hurting more than it is helping. Plants need iron but they need light and CO2 more. In my humble opinion you're just feeding the algae with that stuff. There's more iron in your tank than your plants can use because you're not injecting CO2.
try not to expect results overnight. It took a couple of weeks before I noticed any difference in my tank.. but it happened. My tank went from being completely covered in the stuff (I was soo close to giving up) to being algae free just doing what i mentioned above.
edit: I want to mention that for about a week it didn't seem like anything was happening. The algae continued to grow.. but one day I woke up and it was red'sh in color, within 48hrs 60% of the stuff was gone and in less than a week my tank was completely algae free.
I think it was the water changes removing the excessive iron. However, I want to point out again that if I miss even 3 days of dosing potassium and excel, the algae starts growing back, so it's not just the iron.. but I'm sure even dosing excel and potassium if I added iron the algae would come back.