I cut some clones to put into my greenhouse this year. They are currently in little seedling pots about the equivalent of a red solo cup. The medium I used was PROmix high porosity peat-based. I want to put them into a 5" square pot before their final destination of a 10-gallon pot. My plan was to use a combination soil and PROmix peat for the 10-gallon pots....is this okay? thoughts? also, should I use a combination when I transplant to the 5" pot or stick with straight peat?