With the addition of a new light on my 40G breeder i have noticed hair Algae growing on the plants. Am i right in thinking this is likely due to a lack of CO2? I am looking at DIY CO2 for my 40G breeder, will probably switch to injected in the future due to ease i think, but in the mean time i have a couple of questions I'm hoping you could help with. How do you stop the CO2 being pumped into the tank at night? For a 40G breeder could i use a single 2litre bottle or is 2 going to be better? As a form of diffusion i was thinking about putting the CO2 hose into the intake tube of my Canister filter, would that work? I have a dirt based tank, it was supposed to be a low tech tank but now i have a new light fitting it looks like i am going to higher tech with CO2. With the dirt bottom will i still need to fertilize? Thanks in advance.