Here is a scan of the seaweed its obviously way too many triangles but you lose some of the edge definition of the fronds if you go much lower. If you want a lower poly version or anything let me know since I still have the raw scan data.
https://drive.google.com/file/d/11Lht9Xk...sp=sharing
https://drive.google.com/file/d/11Lht9Xk...sp=sharing