pitch the soil and repot … you might (lightly) dust roots in cinnamon before you repot. don't use the same pot. that looks like … soil? you want something lighter, with perlite. there are also some (pricey) clivia mixes available online or you can make your own mix (see the container gardening forum on houzz) search for al's 5-1-1 mix. your soil looks like it is too wet, promoting that moldy white growth)

bill has some good advice here