Seeing I'm an expert with my first diy co2 for a 2 gal just finished last night... (Ok - I'm no expert, but I have a 20 gal I'll be doing this with in a
I was going to go with just 1 bottle, but now I think I'll use two and stagger the start day of the second tank a week and a half later to avoid an initial `blast` of co2.
108 watts! Thats alot unless you want to boil fish! Yea - go with the 72.
Theres a good, real simple article on this site - but all you do is drill a
hole in the cap of the bottle (not too big) put the tubing in the hole about
a half inch and use silicon sealant on both inside and out to seal it up good.
Checkvalve I see no reason why you couldn't use just one - but I'd get some other opinions - heh. Good luck.