Quote Originally Posted by bonedaddy420
but the plants are only nearly 1 month old, not 2!
ah, in your orignal post you said they were germ'd on March 27th - which would make them exactly 2 months old tomorrow... maybe you meant to put April 27th?

As far as the ph down, I'm almost 100% sure I read on the site that buying the ph kit from a pet store is preferable to looking fr a hydro store, or ordering online, as its just doing what it says its doing, lowing the ph. I would think that if its safe for little fish, that it would be safe for plants as well. It has sulfiric acid in it. Here is a pic of the nutes I have, and the ph stuff, which is for freshwater.
Getting a ph test kit thats for fish water would be perfectly fine... but the solutions to actually modify the ph are a different story. i'd be pretty hesitent to put sulfuric acid... i;m sure it'll work, just be careful not to use too much... h2so4 is very strong stuff.