how do you use it.like when should you change the water?what should i put in the water?do you still cut at a 45 degree angle and shave the stem?whats the sucess rate?what should the ph and the temp of the water be?and how many airstones should i have for a mini cloner maybe 1gal to a 1 1/2gal tupperware.is there such thing as too much air