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Sponges normally have a "exhaust" hole that's in the middle of it. Intake through the sides and pull through body and vent in middle
Yes. This hole was never there before and the entirety of the sponge along with the others have shrunk in mass.
Just noting changes and since putting in the block I've had lots of them happening in a very small time period. I usually don't see this many changes, relatively, at once. That big sponge has been in my tank growing since 2009. I've had to trim it back many times. I've never seen it shed and shrink.
Edit: I should say I haven't seen it shed this much.Definitely haven't seen it observably shrink. I have seen periodic shedding.
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