I don't do much for mold except repot... You could drench the pot with a fungicide ( I don't know what you have available, I use Physan which is a quaternary ammonium compound of some sort. Others may have other suggestions. One thing about watering... rather than spraying, I would suggest watering very well (put plant under faucet, let water run through the pot), then let it dry out for however long it takes (my climate is dry and I would need to water perhaps twice a week, for you, you perhaps a week or 10 days). The running water serves several purposes - it washes salts and other undesirable stuff out, and also pulls air into the root zone. And since these are really "air plants" - in nature grow hanging from trees with their roots exposed to the breezes, that air is very important. Also, as they dry, air is also pulled into the pot as the water evaporates. Again, those roots are getting "humid air" more than "wet"
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