Doctor Doctor! Yellow and Brown Make me Frown :(

[macnasty]

so although new growth looks good initially, those spots keep creeping up. i think it's the ph of the water. thanks rusty. it was going in at 7. i've since started ph'ing to 5.8. hope the new growth is good! i don't understand though, the other two plants, being fed the exact same thing, showed no signs of spots at all. they are perfect. sensitive phenotype??? it still seems to be growing as quickly, if not more quickly, than the other two plants.

Do you spray the plants with anything?

haven't sprayed with anything.

Are there adequate drainage holes, or is the rootball sitting in water at all?

yes i drilled 3 4mm holes in the bottom of the cups and they are not sitting in any water at all

What is your ingoing water ph?

i'm guilty. i've been using water with a ph of 7!

thank you all for your help. keeping fingers crossed.