Welcome to the frog forum!!I'm SO sorry that we missed your post
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Plantation Soil and Coconut fibre are the same, so for a non-planted tank, it is best to use. But for a planted tank, ABG mix or something similar is needed.
You will need both calcium and vitamin powders. Calcium every other feeding and Vitamins once a week. What i *used* to do (before I started feeding nightcrawlers) was i put the crickets in a cup and swirled them around until covered in powder.
3-5 crickets a day for juveniles, every other day for sub adults and three times a week for adults is the proper feeding schedule