Hi Mark,
According to other people, they say that low temperature and a low bioload tank would certainly be the best condition for moss tank to grow well.
I have just set up an erect moss tank with 2 12v DC fan and DIY co2. My erect moss has grown 2cm more in less than 1 week with an average temperature of 24-28 degrees celsius and a 9W clip-on light. However, each of us have their own method of growing a moss tank.
Just my 2 cents,
Bookmarks