Why are sponges bad for hermit crabs?

Natural sea sponges are NOT bad for hermit crabs. In fact, they are a great food source. “But your website says not use to use sponges!” Yes. It does. However, there is some need for clarification…

Sea life: Hermit crabs – Learn to Dive Today Blog

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Hermit Crab Sea Sponge (All Natural Hermit Crab Sponge)

FAQ What foods are good and bad for hermit crabs?

Is this good lighting for my hermit crabs? : r/hermitcrabs

TrumpCrab Sierra Club

tank update : r/hermitcrabs

My Hermit Crab Tank : r/hermitcrabs

This fluffy crab is giving us life - Australian Geographic

Constantia Pets Hermit Crab Real Sea Sponges - 5 Pack Unbleached

After doing a bunch of research my setup is nearly complete, advice? : r/hermitcrabs

Antler Staghorn Hermit Crab - Quality Marine

After doing a bunch of research my setup is nearly complete, advice? : r/hermitcrabs