I've had the same batch of chaeto for 5 months. It's in my fuge lit by a portable work light with a cfl 6500k bulb from lowes. For the first 2 months my nitrates were 20-30 and since then at 0. Phosphates are between 0 and .25. I have film algae, hair algae, and Caulerpa Racemosa growing just fine in my DT I just got a Jbj 25watt Macro glo refugium light for free! Amazon.com: JBJ 25 Watt Macro-Glo Adjustable Refugium Light: Pet Supplies I don't know how old the bulb is. Is it possible that the cfl bulb from lowes wasn't working because the portable work light I was using wasn't reflecting enough to the algae? Should I replace the bulb in the free light I got with a cfl lowes bulb or a new bulb made for the light?