Buce is very similar to Anubias. It's an easy to grow low light plant. Buce does best attached to a surface such as driftwood or rock, glued or tied at the rhizome.
Buying buce already converted to submersed form saves you a lot of time, as buce generally takes quite a while to convert. Any piece you buy has already been in a tank for months and is growing submerse form leaves. They should continue growing well in your tank, given it has the proper parameters.