Quote Originally Posted by Tom Barr
Lots of CO2.
KNO3 and PO4 and they do quite well.
Even at higher temps, they do well.

Mosses unlike many aquatic weeds casnnot use HCO3-, they must get all their carbon from CO2.

Colder water possess more CO2(and all gases) than warmer water, but if you add CO2, you can easily address that issue.

If moss dies rapidly, you likely have either Copper/algicides present or not enough CO2.

Regards,
Tom Barr
Here is some good info on possible reasons why some folks simply cannot grow moss well.

Regards
Peter Gwee