John,
I have a branching bubble with four heads. I've found them to inflate and deflate throughtout the day. No worries.
They especially like to deflate and excrete brown stuff after feeding.
I found that its does take some time for it to adjust to the new tank and didn't fully inflatef for some time.
They don't like high nitrates and high water flow. I was slow to react and lost one the heads. Reposition the powerhead, did a few water changes and left the bubble in the same place. Seems OK now.
Peter
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