I have a few questions about the pressurized co2 system. First off how dangerous is having a large pressurized tank of co2 in the house? Then where is a good place to look up for refilling your tank on a regular basis? Im finishing up my 120g setup and Im debating wether I am going to go with pressurized co2 or not. I would like to keep the price for the setup around 200-250 dollars if possible, and wanted to know if there is any premade setups in that range you would reccomend? If not maybe a general list/makeup of a diy parts you would use.