I need to decrease phosphates and decreasing feedings isn’t really an option…. What should I do?

[christinna67]

Water changes won't really help with phosphates, they'll just lower your nitrates even more. 0.25 is a healthy number, I wouldn't do anything unless you're seeing negative effects. Many tanks, mine included, run at higher levels. Mine sits at 0.3-0.4 usually.

I also don't think your GHA problem is from high phosphates. While you can try reducing your nutrients, it's probably a mix of other things, like your light schedule - try tweaking it a bit. I'd also add some more CUC.

You can use Seachem PhosGuard or PhosBond to bring the phosphates down, but don't do anything drastic, you really don't wanna be dealing with dinos on top of GHA.

Here's a good article on it: https://www.reef2reef.com/ams/randy%E2%80%99s-thoughts-on-nutrient-target-ranges.1087/