Just another ID thread

[Justdrew]

need some help with ID on this one. it’s a new one to me. The appearance has small cupped leaves, reminds me of a full piece of lettuce. I know it is sucking up nutrients as my glass cleaning has almost stopped lately.
Latest parameters
Nitrate: 10.3
Phosphate: .06
Tanks been up in this location for 9 years.
Let me know if you have any thoughts for eradication.
Thanks
Drew

 

[LiLinka]

That’s ulva ( lettuce algea). Can be manually removed or eaten by emerald crabs or other inverts.