Sorry Katherine can't help you as I'm not familiar with coir pots. Coco coconut coir is used quite extensively here for young plants as they don't stay in the medium for any considerable amount of time before they are transplanted. The medium tends to rain too much moisture in our growing conditions and causes a lot of problems for the root system. I don't like to grow mature plants in the coco coir but prefer the better drained charcoal pieces. Yes the inde walls of clear plastic pots turn green with the growth of algae; unsightly yes but harmful... not sure.