Oh - To get rid of it simply use a damp (I suggest distilled or RO water) cloth and wipe down. Try not to let the particles drop back in the tank if you can, but it's not the end of the world if some pieces drop back in.
do you use tap water? is it run through a water softener? if so i don't think its your conditioner (not saying it couldn't be) but what kind do you use?
If you are trying to adjust PH, don't worry about it unless you have very specific reasons to do so.
I used to mess with things to do that and it caused a lot of what you may have there.