Mr Loh, did you fertilize the water which is supplied to the erect moss? Emersed plants are not limited by CO2 and hence nutrients uptake can be pretty great. The heat might be partly the reason but I feel it is the lack of macro nutrients (most likely nitrogen in the form of ammonia or nitrate) which is causing the problem. Since you don't go into stuff like KNO3 or other form of nutrients, you might consider feeding the fish more in the terrarium or add more fish.
Regards
Peter Gwee :wink:
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