I have just read a thread about nitrogen bubbles.
As you may know, I have sand in my 190 l aquarium - but I'm not sure about how to get rid of these nitrogen bubbles that can get trapped in the sand. What fish can I get to stir up the sand? I've got neons, zebra danios, betta and 2 elegans corys so far.
Just when you think you've got things sussed lol