Another favorite food of nudibranch is spounge's. If they have nothing else to eat they may eat those. They like yellow spounges (a common florida type spounge, atlantic). They also eat poisnous spounge's, as they use the poison for there defense. Simular to the poison from zoo's. You may not think you have spounge's, but if you have alot of rock that's been in your tank for some time, there are small spounge's on the underside.
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