Not in the tank, never found anything about it, till now but above in a hang filter..

You have to search the forum for LondonDragon and his shrimp tanks.. He had/has a uge Microsorum Sp. in his HOB filter..
As far as i know only the Microsorum Pteropus is realy suitable for long term submersed conditions. There are quite some different kind of Pteropus around. So there is enough diversity to not need any other Microsorum sp. By now next to the regular i've gathered " Sp. Needle Leaf Mini, Sp.Needle Leaf Large, Sp. Orange, and Sp. Philipino. There are still Trident, windelov, minor and some other (cultivars). All can also grow emersed but need rather a very high humidity anything under 90% and the fern will be in trouble, might do better after addapting a very long time.
You might be lucky some Microsorums doing relatively good submersed for some moths but probably not for ever. The best changes you probably have with the thin leaved Microsorums they need the most humidity off all because this leaf evaporates water relatively fast. For example the M. Musifolium - Sonny Crocket Fern is a thick leaved Microsorum sp. this variant can take lower air humidity much better, but probably will do less good submersed and melt away sooner.