I'm frustrated with GHA and the status quo replies to any questions about GHA especially "you need to find and eliminate the source", but without any further thoughts on how to actually identify and eliminate the source when nutrients are already low and in balance. The source is nutrients and light. You can't stop feeding your fish and you can't turn your lights off forever so how are you ever going to ever truly "eliminate the source", the source will always be there...
I have a 9 month old tank with practically every algae fighting piece of equipment you could buy. Algae scrubber, UV sterilizer, ozone, skimmer, GFO reactor, filter mats. I've read practically every post on R2R and in the FB groups about GHA. I've watched the YT videos including Richard's MACNA talk. I test twice a week, I use only 0 TDS RODI, I do monthly ICP tests, I don't have direct sunlight, I manually remove, I have 4 tangs that constantly pick at the rocks, I tried a Sea Hare which totally ignored the GHA and died after 3 weeks, I tried adding more CUC including 5 tuxedo urchins, I run only blue lights, I have a lot of coral to help suck up nutrients (some of which is slowly dying as it becomes smothered in GHA, especially zoas), I have a good Redfield ratio. Like I've done everything everyone says to do and done countless hours of research. My NO3 is 3.5 and PO4 0.03. As a last resort I tried Reef Flux and I'm currently on day 9 and not seeing much change if any on the GHA yet. It did wipe out my bryopsis by day 3 though. I did identify my GHA as normal Derbesia using a microscope, it's not some weird GHA like Lyngbya.
Even more frustrating than the GHA is that I can't keep Astrea, Trochus, or Turbo snails alive and for the life of me I cannot figure out what is killing them. This has been happening for months. They become lethargic, stop moving, and eventually fall to the sandbed and die. They are not being predated upon, they do not have Pyramid snails, my Mg is not excessively high, I don't have dinos, temp is normal 77-78. Like I cannot find an explanation to this no matter who I ask. Also, no I don't leave the snails in the tank to rot, I take out the dead ones daily.