I just have CO2. Don't dare to use anything else. So far, the moss is growing and growing and growing... and faster than I thought. It grows a lot faster than in the tanks without CO2 and you can see lots of little airbubbles rising from it during the day.

Hmm, jag har i alla fal för mej att jag blev avrådd att använda Co2 här på forumet, får luska lite om var det skrevs någon stans !