OOH peperomia prostrata!!!
How big are your biggest leaves? Mine are pretty small on par with tricolor in size, maybe I have them in too much light (about 6-7" inches under T5HO)?
That Pep is great too I have chains of it dangling over the moss wall in my crab tank!
Yeah, I planted that huge clump but all I have popping up are the tiny leaves you describe and not green like yours but yellow like a pouting mini orchid, there are lots of root/traps invading the live sphag outside the net pot though! LOL
Hmm, Pep. serpens?
I still don't know what I have in one of my Violin mantid tanks, it's a Pep of some kind but almost 20" tall with 1-2" diameter leaves with red pattern ontop! LOL