soil looks acidic from the ph meter is the level 4.5-5? what kind of mix are you using(how much peat and how much perlite)? you could have a PH lockout issue causing all the problems. if it is lockout then you need to flush with PH'd water like your doing, 2-4(i forget) gallons of ph'd water per gallon of pot size. tips look a lil nute burned but nothing bad.

looking good so far so keep it healthy