anyone familiar with DIY rockwall?

[BigAl07]

I'm not sure if they ever 100% confirmed it was the foam but a Canadian reefer took his tank down because everything "Foamy" was growing so much hair algae that it caused him to tear it all down.

Just keep that in mind...

[Doc_Polit]

In researching this myself, a lot of other reefers have stated that the black pond foam is better to use than Great Stuff.

It will resist uv better and you can skip the epoxy coating.