I have to agree with
@Lavey29 in that you probably don't need to dose as much stuff as you are. I just dose to keep up with the tanks alkalinity consumption.
This tank gets 25ml ESV 2 part and nothing else except a 25g weekly WC. Tank is 285g total. I did try elimi NP and it did absolute nothing for my higher NO3 and PO4 levels. I run some GFO when my PO4 gets over 0.9 which is as high as I can test. I like to run it below 0.5 but don't I over it. NO3 was 30+ but was down to 17 Sunday. I started skimming wetter and changing my socks before they overflow. I was letting them overflow for a couple days.
Tank has been running 1.5 years and I've never had an algae problem.
This tank is about 60g total volume. Been running for over 3 years and I dose nothing but all for reef.
WCs are 4g every 2-3 weeks. Never had an algae problem with this one either.
I'm starting to think no action is the right action sometimes. Sufficient cuc a little manual removal and time for the tank to mature has worked for me in the past when I have had nuisance algae issues. Any time I've tried dosing something for algae matters always got worse.
This tank has a lot of what sounds like you may be dealing with. It looks a bit like GHA but is brownish and comes off easier than GHA. Some times I'll blow it off or vacuum it out. I pull frags ams brush them off. My snails do a good job also. I dose nothing but AFR and the algae appears to slowly be fading away. Tank has only been running 6 months or so. NO3 is so low on this tank I dose ammonium bicarb to keep it detectable and PO4 runs below 0.05 so that tells me elevated nutrients are not the cause of the nuisance algae which is what people usually blame for the cause of algae.
Snail at work
I was even getting clumps of algae growing in the sand and that has stopped. Another reason I believe time and patience play a big part.
A recent image.