What is this

[SantaMonica]

Who can guess

 

[xxkenny90xx]

Marijuana grow out?

 

[Feet4Fish]

Looks like dIY water fall scrubber with some dang fine light maybe in a metal or at least highly reflective housing.

 

[Bfragale]

Homemade algae scrubber?

 

[ichthyogeek]

Algae Turf Scrubber.

 

[najer]

ATS.

 

[SantaMonica]

Marijuana grow out

You wish

Looks like dIY water fall scrubber with some dang fine light maybe in a metal or at least highly reflective housing

Sounds correct

Homemade algae scrubber

Waterfall style, yes

Algae Turf Scrubber

Yea baby.

ATS

You bet