Agree with repotting. The conditions that permit mold to grow are not what plants roots appreciate in a pot.
In the UK, potting soil is referred to as compost. In the US, compost usually only refers to freshly decomposed organic matter, like from a compost pile. One wouldn't want to put actual compost in a pot, it's too muddy and water-retentive. A porous, chunky potting soil should help you be able to keep roots moist w/o rotting or growing molds.
Dracaenas, like other woody entities, enjoy being repotted periodically. especially if there is organic matter in the mix, which decomposes into smaller particles that retain more moisture and subsequently, have increasingly less oxygen between them, which can suffocate roots and is called overwatering if it kills them. Repotting, including trimming any really long or large roots and replacing the old soil with new is how bonsai masters are able to keep potted trees alive for hundreds of years. It's often possible to put it back in the same pot after repotting, like a bonsai, depending on how much space you have to let it get bigger. Outgrowing your house is not much of a concern with the species referred to as 'Florida Beauty' (D. surculosa,) but the repotting info still applies.
