My Persian Shield looks a bit off & I wish I could keep the leaves purple. Any idea what’s causing the speckled look or how I can keep it purple while growing indoors? Dr. Planta said it may be under fertilized. Location: indoors (office environment) Lighting: 1 foot from a south facing window (currently shade in the morning & sunny in the afternoon) Water: it’s watered twice a week (it will droop after about 4 days & perks up once thoroughly watered) Fertilizer: probably fertilized once a month with Foliage Pro SuperThrive Pests: nothing seen on plant or in soil It was repotted into a Naked Root planter about a month ago & the roots are thriving as they have begun growing towards the sides and bottom.