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I'm way new to this so people that know all this can easily tell me to **** it. Lol.
But mine usually will close up when I do water changes and then open up slowly after. Then look all happy like nothing is wrong.
And I went away for a week and had a friend take care of the tank and he didn't top it off. So then I got back my pump was burned out and was getting ride of bubbles under rocks for a month. An they were closed up on me for a few days bit opened back up later like nothing happened.