Ben,
Firstly, I won't consider myself a moss expert but then again, my moss is doing quite well in my tank.
One of the most important considerations for moss to thrive based on my experience is the temperature of the water. In Singapore, where I live, if I turn on my lights for a duration of say 10 hours, by the end of the lighting period, my water temperature can be as high as 35C. When that happened, my moss was browning. To overcome the problem, I invested in a chiller to maintain a water temperature of about 24-25C and since then, my moss has been thriving.
Based on your GH, KH and PH parameters, it seems like you are not using any CO2. My water parameters are the following:
PH 6.4
KH 4
GH 7
Some do report that moss do well without CO2 in their tanks but I have never been able to achieve this. And from what I gather, moss that thrive well without CO2 are also populated using the emmerse growing method.
I am not sure if I am helping much but that is all I can share with my successes with keeping moss.
Cheers,
Roger Thien
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