I've been unsuccessful with mini pellia too. Bought bright green and after a few months turn dark green/black. While other moss like x-mas moss grows like weeds, my many batches of mini pellia bought from various sources seems stunted. Place them in high light or low light areas of the tank seems not to change anything.
My fert regime is the usual dry dose NPK + trace. Every other plant type, red stalk plants, rosette plants and hairgrass thrives. I have this feeling my tank pH is a factor as I keep it low at pH 5.5 during the photoperiod. I also use ADA soil.
My tank temperature too is set to 25-26C. My tank is a high-light tank setup with areas of low light using DIY LEDs and CO2 injection via external reactor. I use 1 deg pH drop to determine ample CO2 instead of bps though this is not a guarantee way to be sure of sufficient CO2 but it works for all my other plants and fishes.
Wanted to reduce CO2 injection to increase pH but I do not want to slow down growth of the other plants. My situation is every other plants and mosses are ok except mini pellia. So I can safely say nutrient/light/temp is not the issue, at least, for me. It could also be water flow or agitation on the mini-pellia as my cluster is in the flow of my powerhead too. Maybe even could be down to some dumb luck. I have spent a considerable amount of $$$ to acquire them. Sigh.
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