They mostly prey on craby patties.
Spicules
spongin and spicules are the sponges body support and defence
Sponges have a variety of defenses against predators, including producing toxins, secreting a distasteful substance, releasing mucous to trap predators, and being able to quickly regenerate if damaged. Some sponges can also contract or close their pores to protect themselves.
Spongin is a tough, fibrous protein that provides structural support to sponges, making them difficult to consume. Spicules are tiny, needle-like structures made of calcium carbonate or silica that can be sharp and harmful if ingested by predators. Together, these structures make sponges unpalatable and unattractive to most predators.
Sea Sponges hide from there predators by either camouflaging themselves or either not hiding at all.
Yes sea stars are predators, because they eat barnacles, chitin's, snails, urchins, limpets, sponges and sea anemones, and that's what makes them predators.
Sponges primarily rely on their ability to filter water to capture food and remove waste, but they have developed several defense mechanisms against predators and pathogens. When threatened, sponges can produce toxic chemicals or release bioactive compounds to deter predators. Additionally, some sponges can rapidly close their pores to restrict water flow and limit exposure to harmful organisms. They also utilize a form of cellular response, such as the activation of immune-related cells, to combat pathogens.
tigers, lions, snakes, snails, bears, spiders, worms, coral, and sponges
Many sea sponges, like anemones, use toxins to repel would-be predators. Some species of sea slugs, however, such as Platydoris scabra, have evolved immunity against the toxins of specific sponge families (in this case, Microcionidae). This adaptation benefits the slugs in two ways. First, they don't have to compete with many other organisms for the sponges. The sea slugs can also concentrate the sponge toxins to foil their own predators -- at least until the slugs' predators also evolve immunity to the toxins.
sponges use toxins to repel would be predators
Sponges have very few predators primarily due to their physical structure and chemical defenses. Their porous bodies and rigid spicules make them difficult to consume, while many species produce toxic or distasteful compounds that deter potential predators. Additionally, their ability to regenerate quickly after damage makes them less appealing targets for predation. As a result, they occupy a relatively safe niche in marine ecosystems.
Spongin and spicules are the sponges body support and defence. They both cover a sponge, and if a predator eats it it will be hurt. It will be hard to eat it, because of the sharpness and roughness of the outside. Well at least in the spicules case.