critical mass auto help

hello got a problem with my babys. there 4-5 weeks old in canna terra pro soil using bio bizz nutes 2x 600 watt hps. well 3 feeds ago I gave them a dose of nutes at 1ml per 3 litre . but on the bottle it says 2-4 ml per litre . well they took well to the feed few days aho no burn ect then next feed used water then yesterday used nutes again but a lil stronger at 2ml per 3 litre wich still is pretty watered down well went to check the babys this morning and theve gt what looks like could be nute burn . any help or input much appreciated. other than the burn today theve been very healthy .

Can you get some pics in natural light?

Wash them with 0,5ml nute/l

ill try and get some better pics today . stil tho would u say its nute burn or a defficiency ? like I say its only on the 6 thats been fed nutes

I would first check the soil ph. it needs to be 6.3-6.5. Also, what is the Ph of the nute water. Always make sure the plant is in the proper ph before you do anything. They look stressed though.

not sure of the ph this moment will be checking 2moro this grow has been done on a budget just getting ib bits and bobs I need along the way and tbh I tottaly missed out a ph kit gunna go grab 1 first thing Monday morning scince u just reminded me lol im a total noob lol.. but as I say 6arent looking as good as the others the 6 being the ones that have had nutes. cheers for the input. anything else I should get for them when im at the hydro shop? wsd thinking of some superthrive and some root stimulator?

superthrive works miracles,it`s only 10$ or so...