a co2 cylinder would be more economical in the long run. get the biggest cylinder that fits in your cabinet and your pocket. try looking for it in your local fish shop or co2 gas resellers. some do get their co2 tanks from shops that sells co2 fire extinguishers or home brewery equipment.
normally, you'll use gravel that are 2-3mm in size. get enough to give you 1-2" thickness.
there are a multitude of fertilizer available but look for those that gives you the ingredients. you should know what you put into your tank.
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