ok well im making a DIY co2 injector from this site http
/www.fishforever.co.uk/carbondioxide.html i wanted to know if its pressurized or if it needs an air pump. Also how long do i leave it on for? im making a smaller version of it with a 591ml pop bottle because my tanks only 25gal and i only have 6 live plants.
Thanks!
DL

Thanks!
DL