I took the liberty of tweaking the eagle ray pic. I've been working on tweaking UW photos, so this was a good opportunity to practice a little. All credit/ownership/copyright goes to @Pipehorse, I was just playing around.
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I guess it would be another form of pollution, what about 3d printing some shells for these guys. Not sure they'd take to the plastic/nylon. and probably not a good idea anyway, Just had this vision of hermit crab taking to some designer shells instead of some random jar.I remember some donated shells getting readily accepted!
@Pipehorse = The Dean of BHB College of Fish science !!.. I'm assuming this is you! Congrats!