This is a small 2gallon hydroponics container and every 3 to5 days it gets this white chalky stuff at the bottom of the bubble stone!
Not sure what it is and have never seen it anywhere else.
I use well water and my friend thinks it's calcium settlin at the bottom!
I also have another question for you, why do they look like this!
What is this brown crap, I don't like my girls looking all busted up.