Yeah i agree with daihashi, it does look like a little bit of nute burn. Personally I like to flush my plants roughly every month, i use organic ferts and i've been told that you don't need to flush with organics but i don't think a flush can do any harm. Just something to maybe keep in mind should the problem get worse.

I use bio bizz grow and bio bizz bloom. For vegging i just use the grow and in flowering I use both the grow and bloom combined. I start with 1ml per litre between 14 and 21 days old, go to 2ml per litre weeks 3-6. When i switch to 12/12 I back off on the grow to 1ml and start with 1 ml bloom also, I keep the grow at 1ml thoughout flowering and increase the bloom gradually to 3ml by around week 5. I'm no expert but thats how I do it. But i'd change it around a bit to suit how big the plants are and how long i'm vegging etc
hudson88 Reviewed by hudson88 on . First grow indoor growbox ok, so after the first semester n part of the second semester at college i blew way too much money on trees, so me and my friend thought we`d give the growbox a try...heres some of the pics: first pic is the setup (Two 55gallon tubs we havent connected em yet as it isnt necassry thats why in the pic they arent connected) if you look closely you can see in the base tub there is a small fan(Outtake) on the left side of the tub. its covered in the black electrical tape lol, the other fan we have Rating: 5