Do plants trimmed plants normally send up bubbles?

[Spilk]

I'm getting used to them being covered in teeny bubbles since they're actually getting light and nutrients since I retrofitted my hood and gave them a better substrate . . . but I had some grass and some Aponogeton that needed to be trimmed suddenly. So, you know, I go in with scissors and fix the situation so that they don't branch out over my tank and so forth.

Now, everywhere I've cut them back, from the leftover stem stubs is coming a steady stream of bubbles. At first I was like, hey, the stems probably have some air in them for some scientific reason I don't understand . . . but it's been going on ALL DAY. So, is this normal? A good indicator? A bad one?

Anyone have any insight?

 

[Spilk]

You know since I've already made this thread I also have another question.

I had a problem with common duckweed not too long ago, and so I scooped all but a few plants out (does it ever go away! JEEZE!) and finally, resolved that it does not in fact go away (it just raises false hopes and the reappeares using some kind of magic I'm still analyzing), I just buried the roots of a few and now it looks like a handful of clovers growing out of the "ground".

Will they propagate/live with most of their root buried? They'd look pretty neat as a carpet.

 

[Aulonochromis]

My plants bubble like that as well where they have been trimmed or injured, it's almost like a little airstone. It is oxygen bubbling out of the plant, it's nothing to worry about, it is an indication of photosynthesis. I don't know about the duckweed, but it would be cool if you could grow it into a carpet.

 

[Silly me]

duck weed die soon after its planted.