ID? Translucent, hair/tree like stuff growing in shade in multiple areas of tank? Not slimey nor rigid.

Getting full already and they have barely started growing yet.

Is this GHA? It's not green, it looks brown to me but could be from my largely royal blue lighting config. It's single dots with multiple strands. Glass/glassware only, not stone. Brushes off easy. Looks like diatoms to me but.. the strands?

Thank you

Hammer heads! I read that they are unlikely to survive due to shading. Any tips or just let them be?

ID: red/brown filament-like from base of candy cane on right bottom. It retracts when I try to grab it with tweezers. I've researched and can't seem to identify it?

Also, red spot on left likely scaring from LFS fragging it.?

Tank is 1 month old, coral is one week in tank. No other algae in tank, only 1 coral.

Are these tentacles normal for Trochus Snail? Or aptasia/pest? New to hobby, just added CUC yesterday. Thx