Help with algae.

[acrum222]

This started off as a matt of what looked like cyano over the sand bed. Tried weeks of weakly water changes and manual removal only for it to keep coming back. Dosed chemiclean and after that the sand bed algae dispeared. But now more stringy algae exploded over the rock work and corals of what might be dinos. It blows off the rocks and corals easily with a baster. But comes back within a few hours. My parameters are.
1.026
79 degrees.
Ammonia and nitrites 0.
Nitrates are 2.5 to 5. And phosphates are .03 with gfo.

My lights are sb reefs leds and skimmer has been off for a bit with the chemiclean.

I thought that lowering nutrients was good. But the more I read upping my nutrients might be the way to fix it unless I'm confused. Which I am. All help is much appreciated!!

 

[KrisReef]

Your nutrients are not zero, but your description matches dinos, imo. It seems like you have nutrient export in control.
I am wondering, how much "wave" or turbulent circulation do you have in your system? I was told to "blast" my rocks during water changes to help keep them (and the tank) clean to help battle unwanted growth on the rocks. I went bare bottom and removed a lot of structure (over time) to improve water movement and detritus out-migration into the overflow sock and skimmer. Just wondering if you could use more tank water movement? hth

 

[acrum222]

Yeah I dunno. It's a 65 gallon tank have 2 voyager 4s and a 800 gph return pump. Use rodi water tds is 0. Fish load is 2 clowns, a wrasse, a small yellow tang, small flame angel, and a diamond goby. All added fairly slowly and it's been running for almost a year and a half now. Stumped cause I don't wanna start losing my corals!