Thanks!! I built the stand and canopy too. That is the roots of some Devil's Ivy hanging in the tank. I keep it growing on top of the hood. You can see the leafs up on top. Nitrates are 0 all the time. I had the tank severely overstocked a while back and nitrates were still 0. That stuff is no joke. No algae problems either. Next tank will have a sump so I can dedicate a compartment to the root system of the ivy. I don't really like the roots in the tank but the fish LOVE the roots.