Mini Pellia is said to be a Riccardia species. And btw, you have Süsswassertang in the photos with Mini Pellia, not
Monosolenium tenerum.
Yours looks a bit different than mine, so it might be some other species or then they just grow a bit differently in different tanks. Killies.com is a good place to ask for a species ID if you want to.
Oh, and I forgot to add, it really is a cool plant, reminds me of emersed Riccia. Well, Riccardia and Riccia, not a big surprise that they look alike.