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Lanthanum Chloride is the way to go for lowering po4 that far. Just be careful not to go too fast if you have corals
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That is way too fast. Especially considering the impact lanthium chloride can have on kh. Whatever method you use you want to be reducing by less than .1 per day.I would use Phosphat-E - Phosphate Remover or Phosphate Rx and drop them over a period of a few days.
Day 1 I would drop them by 0.31
Day 3 I would drop them by 0.31
Day 5 I would drop them by 0.21
maybe use gfo to bring down the 0.11 over 2 days. get them to 0.03 - 0.08
Phosphate Rx is Lanthanum Chloride. make sure you have a filter sock and make sure you are skimming using the two chemicals.Lanthanum Chloride is the way to go for lowering po4 that far. Just be careful not to go too fast if you have corals
might be too fast but I have used that formula twice with no ill effects but all systems are different. I also run a Cal rx so my alk never really dips.That is way too fast. Especially considering the impact lanthium chloride can have on kh. Whatever method you use you want to be reducing by less than .1 per day.
How often GFO be changed?
Gfo needs changed when phosphates start rising again(generally a month or two).
Some additional info I found: https://www.melevsreef.com/critter/red-coralline-algaeI almost want to say that purple stuff looks like some type of cyano. I could be wrong. Coraline algae is not that thick and dark.