ph and tds meters absolutely necessary?

[Zandor]

i knew it was gonn abe like this but
this is the way i learn best.
now that i know first-hand what not to do
i am more aware of what to do
it cant get any wose only better
and the worse aint all that bad
my ph is proboly like 27.0

Well friendowl at least you know you will get better and are willing to learn more. :thumbsup: