I like coco peat / coil like Trex forest bed it is cheap 20$ for 121L It lasts 20 changes for me and kinda clumps when wet really easy to remove soiled bits. I used to use cyprus and then a mix coco cyprus then I stopped bothering with the cyprus as it was a bit of a pain to clean out (I vacuum first then sterilize) It holds humidity well almost too well I dry it a day or two before I use it but the best part unlike cyprus when it drys out you can re wet it and it re-absorbes the water.