looks nasty overfeed/underfeed? advice appreciated

hi all, if u recognise this for sure please give us a nod and set me straight will ya? my experience tells me its nute burn, but i find it hard 2 believe as i have only bin giving plant start nutes and they were already 9" tall as clones.

they were put into rockwool cubes presoaked wit formulex plant start. then 6 days later they were foliar fed with formulex. about a week ago i foliar sprayed with HALO and jus give water. as of last couple of days the leaves at bottom of three cheeses have twisted and contorted pointing up /down and turned brown at tips then spread over leaf gradually, wasnt bothrerd at first now im worried . should i flush or is it under nutes as they were also switched to 12/12 a week ago and havent recieved any bloom nutes yet. if you look carefully u can see the yellowing of the bottom leaves also, which i belive indicates lack of nutes ne 1 wit a clue let us know wat u think thanks!

It's N def, and P def, and K def. The general yellowing = N def. The brown, raised edges = K def. The brown curled up tips = P def.

First thing you need to do is check your pH, for soilles mediums it should be 5-6.

If the pH is normal, then your nutes arn't worth much or you're not ading enough.

Get better nutrients. All the information you need is from Doctor Cannabis above. Good post Doc =]

that wud make sense as i havent given any decent nutes yet , just the plant start. i switchd to 12/12 a week ago and havent given any flowering nutes, i jus didnt want to make an over fert prob worse by adding more, but if u say its nute def and i do see the sense in wat u say, then i will add some full strength nutes tomorrow. i think if nute def is the prob, that adding the halo to boost plants photosynthesis rates doubled wit lack of nutes really aint complimented eachother! thanks for help i take it u sure thats the prob dr or u wudnt have said right?

Yup, I'm sure.

Don't give it full strength all at once. try 1/2 strength first, see if she can handle it nicely, and then raise the concentration.