Rhizomes need to be above the substrate and not buried. Very important. Like Anubias.
They grow faster with medium light. High light can be used but they don't seem to grow any faster with higher levels of light. It just increases the chances of algae growth.
So medium light is the best compromise.
Buces love CO2 and will grow faster with CO2. Excel (or equivalent) can be used but it wont be as fast. Note: Both CO2 and Excel isn't recommended 100% in shrimp tanks.
Ferts as per all rhizome plants. They take ferts mostly from the water column, and only a little through the roots, if you have the roots in the substrate (note the first tip: rhizome above substrate). So you need sufficient N, P and K as your major fert elements in the water column. Grow them partially in the substrate for fastest growth, so they take ferts from the water as well as from the substrate.
Once they start growing larger, you can propogate them by cutting the rhizomes, like anubias, ensuring you have leaves, rhizome and roots on each cutting.
They like cooler temps, as mentioned. With flowing water, to "catch" more ferts in the water column.
The buces I had are very sensitive to changing water conditions. So transplanting them, or setting them up in a brand new tank will shock them and you could loose a few leaves to melting. So avoid changing from submersed to emersed growth if possible. Med to High CO2 during these changing conditions will help heaps to avoid the melt.
So you could say that some, if not most, of these requirements are not shrimp friendly, so a dedicated plant tank to condition and strengthen them before they are introduced into your shrimp tank and their permanent home will be a good idea without stressing out your shrimps just so you can get the buces established.
Once they are in a permanent tank, you can reduce CO2 to almost none, zero ferts except for the shrimps and lights can be reduced to low levels - a low tech tank basically. You might find that high CO2 will produce more growth in leaves and stems, but in low lights, the buces produce more flowers.
Oh yeah, you can attach them to wood or rock with thread or even superglue.
And CO2 isn't necessary, only if you want it to grow faster.