CO2 System?

[hi427893]

Do I need a CO2 System? I have a 20 gallon tank with 2 hornworts, 2 Anarchis, and a Rangeri Sword. My lighting is a 17 watt 8,000K full spectrum lamp. I have a Tetra Whisper x30 filter.

 

[Xand3r]

Hello hi427893
You should http://www.aquariumadvice.com/forums/f24/read-this-first-resources-and-references-83826.html