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…

Yellow Ball Sponge & Blue Leg Hermit

My Hermit Crab Tank : r/hermitcrabs

Humidity for Land crabs and Hermit crabs. How to Control (Increase

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Hermit Crab Sea Sponge (All Natural Hermit Crab Sponge)

A little hermit crab covered by a sponge instead of a shell. A

Hermie Crab Adventures — HOW TO NOT KILL YOUR HERMIT CRAB 1. The

Is It a Rescue? The Crab Street Journal

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

Hermit Crabs Talk from the Tank

Blue Leg Hermit Crab, Medium - Clibanarius tricolor - 12 and 50 Lots

New habitat for my grandkids crustaceans! : r/hermitcrabs

My Hermit Crab Tank : r/hermitcrabs

Sufficient quantity: there are 12 pieces of hermit crab sea sponges in the pacakge, with bright yellow color for easily attracting hermit crab to

12 Pieces Hermit Crab Sponges Pet Crab Sea Sponges Unbleached Hermit Crab Supplies Sponge Provide Nutrients Crab Sponges Hermit Crab Accessories for

TrumpCrab Sierra Club