Unpot immediately!!!! Throw away soil. Prune roots mercilessly and possibly some leaves if plant is too top-heavy. Dunk leaves in water w.a little bleach. Repot in bigger pot (also should be scrubbed w. bleach and water) w. sterile (store-bought) soil. NO natural spongy white stuff belongs in healthy soil. Keep away from other plants while you watch and wait. It may be a goner....sorry.