When I first used Reptichip, I mistakenly hydrated the entire block thinking I could just store it somewhere and have it on-hand. I'm not a breeder myself. You'll be surprised how much that block expands into! I'd recommend breaking the block as-needed. It's easier to store, saves space, and you won't have to worry about "wasting" anything. Although there certainly are more responsible people out there, I also made a newbie goof of not letting the chips fully dry before storing and they molded pretty quick in the bin. Good luck, it's a great substrate for humidity!
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