In my experience, they sometimes stay "dormant," but then they can go ape and multiply like crazy in a matter of a few weeks. It's going to take some time before those new mouths split into separate ricordea polyps.
Well it looks like ALL my ricordias are multiplying right now. The one with four mouths looks like it is about to split, which is a HUGE change from just this morning. It's barely attached now, and the other ones either have multiple mouths or look like the mouth is splitting.
I've had them go crazy and split in a matter of days, and I had one that started then stopped- it had two mouths, and never went on to split during the next two years I had it.
Just wait until it splits and either spread them around in your tank or sell the extras.. I'd figure if they're going to all that work of splitting and such, they must really like your tank..
What is the difference? I don't know it. I believe the Yumas are the ones splitting like crazy. I think I only have one florida and it looks like it wants to start, but hasn't yet.