I have been reading about pressurized co2 lately, I am about ready to try it. I have been putting it off because I don't want to spend the money. Half of my dwarf hairgrass has melted away, some seems to be growing still tho. Been planted several months now, high light, mgps capped with eco complete. Anyway I want something cheap and simple that I don't constantly refill. I was thinking a 5lb co2 tank I found on Amazon for $50. Also a co2 regulator also on Amazon, by terra bloom, for $43.99. Also, where can I fill the tank and how much will that cost? Just trying to make sure there are no unexpected expenses or anything I need to know before ordering them