Hi Jenny
When you say that you repotted into mulch/soil, do you mean orchid bark? Orchid bark is easily purchased at big-box home improvement stores (Home depot, etc.). The pot should have good drainage holes.
I recommend that you water differently. Each time you water, run as much water as you want through the orchid bark and around the roots. Water at the sink. More water actually gets rid of excess salt buildup. Typically I run water through the pot for roughly 15 seconds per plant. Although less frequent watering is better than watering too often, twice a month is probably not often enough. You want the bark to be almost dry, but not quite, before watering again. This is usually equal to once or twice a week, but can vary depending on how the plant is potted and because of environmental factors.
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