LF clear eggcrate

[MKLKT]

At home depot it can be found in the same section as the ceiling tiles. (Found this out when I couldn't find it in the lighting dept.) As stated earlier they have white & chrome. It's also known as light diffuser which is why clear wouldn't be a likely option.

Tons of people use egg crate for frag racks with no phosphate/algae issues, I'd be inclined to think that's a less common issue than moreso. I've had my rack in my tank for about 2 months and all it has is coraline algae patches.