Oh Calatheas! Kind of the Kardashian of plants....as well as the coveted Fiddle Leaf Fig. These guys are SO beautiful but they take a little extra work to maintain. No nips and tucks. Calatheas are super sensitive to tap water as there are many added minerals in the water - salts, fluorides, chlorines. This can cause chemical burn and cause your leaves to yellow or sometimes curl. Water with distilled water or let you water sit out over night. Leaf curl can also happen to irregular watering and lack of humidity. Make sure these guys stay moist (not saturated!).
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