Hi there, i will try to answer you.
1) Whats the dif between US fissidens and normal fissiden?
Firstly the real name for the nick: US fissidens is fontanus fissidens. The different is on their growth patterns, size and actually many more, need to research more on that. I had thai fissidens before and its growth pattern in erected growth.
2) Does it requires very high maintanance?
For my fontanus fissidens, i tied them to driftwood and some to wiremesh. it is not high maintenance but i still learning on how to keep my tank in balance state to prevent from algeas. I do find that fissidens do grow well in well lighted place and of course if can provide a cool enviroment would be better (chiller) but for my case low budget only using one fan. Once they have grown no maintenance is required except for balancing ur tank as well as periodic water change (i did mine sometimes ones or twice a week).
3) How to grow them best? On drift wood? rocks?
Driftwood wood would be best but wiremesh is fine too. i never tried on stones before so cant answer that portions.
Hope i did answer your questions. i am myself still learning and i hope if you have more infomations on fissidens do pm me about it. Wish you well and all the best!
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