I’ve used aluminum oxide in the past, and recently I’ve just been doing water changes. And both have worked but I was changing like 10 gallons a week easily of water in a 60 gallon system. I just put some seachem Phosguard in my overflow last night and phosphates are back down to about .04 this morning corals are perking up a little I’m hoping to see them looking even better in the morning.What have you used in the past to get phosphate down that improves the coral look?