+1
Open the bag underwater..Any air at all and it die a slow death. They like the dark so place under a cave or large overhang. They also require allot of food to pass over it so direct a power head to make sure it has lots of flow. A sponge feeds on nutrients from the water and it can't draw food to itself, it completely relies on the current for that.
Angelfish eat sponges, so keep that in mind. Algae will clog it up and kill it, so that’s why we keep it out of direct light, unlike a coral it doesn’t not open if it is unhappy..If it starves it begins to shrink, until it is a size the food supply will nourish.
Hope that helps..