ROCK WALL!!

Cool but you'll get a ton of algae buildup on the sides, will be a pain the the ass to keep the sides clean, you'll have to always move the rock. Plus, I never think it's a good idea to put rock on glass......................JMO. Good luck though.

are you talking about algae building up on sides where the rocks are against the glass? I had those rocks there over a month now and never had any algae building up on glass- I did have algae on the rocks themselves tho which snails and newly added refugium cleaned up nicely