Riccia will not stay attached, if it ever does, when submerged. Also, if you keep it tied to something, you need to constantly trim it to make sure that the lower parts don't die off. If that happens the riccia will just float away. Buttermilk will smell and look funky for a while, but it should work. Make sure to aerate well!
Last edited by Hobbes1911; 12-02-2013 at 11:17 AM.