Let's talk repotting.... I must have screwed up my last soil mixture because it is retaining way too much moisture. I used both coco coir and potting mix by mistake! I have had several plants with root rot and now am in save the plant mode. If I repotted in the last month or two....can I reuse that soil (microwave sterile) and just add in more chunk, or is it better to throw away any used soil and start fresh? Thanks!