sifting
sifting
hmmm...i don't do it regularly (too lazy)....but i'd say around 2 weeks to a month. any longer and you might get some buildup of bad byproducts, i figure. then, when you stir it, boom, there goes your mantis. i read a while back that some starfish can be used for this, and i do not think mantis go for starfish (?)