I forgot to say Shout out to MasterAquatics that has a awesome Angle fish channel for requesting this video . The co2 is pumped into the inlet side of a FX5 canister filter doing this makes the co2 completely dissolves in the water column if you are using a ceramic diffuser or a ladder or whatever and co2 bubbles are popping at the surface of the water you are wasting co2 The site i used to buy my dry Ferts has changed and dosnt look like it is a good of a deal as it once was but i have found you a better one http://greenleafaquariums.com/aquarium-fertilizer.html you need to buy them by the pound, individually, don't buy blends, they are a rip off CSM+B is micro ferts Potassium Nitrate [KNO3] Potassium Sulfate [K2SO4] Mono Potassium Phosphate [KH2PO4] some times you might need Iron Chelate - 0.5lb but not a lot, you can buy Magnesium Sulfate [MgSO4] Epsom salt at wall mart you can use http://www.aquariumcalculators.com/aquarium-plant-food/estimative-index/ for a dosing calculator that is how i started but have found out i can get away with only dosing once a week or longer and use http://deficiencyfinder.com/ it will show you pictures of plants with Deficiency's best guide i have found yet. I have only used maybe a half pound out of each bag in almost a year dosing a 240 gal system