Q: Do you wonder why Aquarium Gallery's aquarium plants look so beautiful?A: The secret carbon dioxide we use it on all of our planted aquariums. Did you know Co2 (carbon Dioxide) at Aquarium Gallery is as important for our planted aquariums as Oxygen bottles are for people in hospitals 99% of the aquarium plant displays in store are fertalised with Co2 approx 8 hours a day. That's the #1 secret to keeping the plants lush.