Feed each watering. A bag of a good soil mix should feel like a nice, fluffy, soft, pillow. Streptocarpus can be grown multiple crowned. Remove old, yellowed, leaves and spent blossoms. Most flowering houseplants will need repotting into fresh soil every 6 months or so.
Shallow pots are best.
Use very light rooting media. Leaves can be protected by placing in a clear plastic bag or covered container.