What causes bubble??

[Tmaida17]

Every once and a while I'll get a bunch of little bubbles all over the glass,rocks, and sand. If anyone has any idea what causes it please let me know.idk if its good or bad, and google didn't seem to help me when I looked it up. I'm changing the water tomorrow so maybe that'll help.

 

[redsea]

Here is just a guess:

Maybe they are the bubbles from when you pour water in after tanking water out or for a top off. Or maybe you have some kind of creature in your tank making the bubbles......

 

[Tmaida17]

I didn't take any water out until tomorrow but I did add a little to quiet the filtration system bc the tankis in my room and I can sleep when It makes a lot of noise. I did notice that my cleaner claim service this morning and he just buried himself under the same again and that's when it started. Do you think it's because he stirred up the sand?