I share your interest elendil. i am alos new and in process of collecting nice fissidens to make a tank with a whole lot of themback to your question:
1) i think you could ask around with fellow aquarist about this, maybe they have spme to spare
2)i cant give you an answer for this. but i am using normal PL light and they are growing fine.
3) i dont know but surely PL is better than FL.
Hope more experience bros/sis could help you out. Have a Great day!
Jumali
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