Indoor Have an a problem have some spotsI don’t know what or is from

[Nitro]

Today I gave them water PH at 5.80 Test the soil pH It did seem to go up a little bit Is that a good level in pic if not what can I do And leaves they get a little worse But it seems like not that fast as the other ones so I gave it another shot col mag 1.5 ml to 1 Gallon My one friend suggested Neem oil just in case if it is bugs Is there anything else that I can do