No, no cool-tube, and no co2, not yet anyway! lol I already have an 80 cfm bathroom vent fan, but I want to get a nice 2-300 cfm 4 inch vent fan with a carbon filter. Since all the duct work is already installed it should be easy to hook up. After that I was planing on buying a 600 watt HPS light, with an Adjust A Wing reflector, and a digital ballast, but maybe I'll look into a cool-tube instead! I hook ducting right up to the cool-tube reflector right? I have the rest of Spring, and the whole summer to plan, research, and save for my fall project. I've also been saving for a new puppy! I want to get a solid White German Shepherd, not only for a pet, but also to protect my plants! Some poor legal Medical patient with a permit in Road Island is sitting in jail right now, because a masked man broke into his apartment with a pellet gun trying to rob his crop, and the patient shot dead the intruder! A clear case of self-defense! I think A dog would scare away most would be shit bags! LOL