Help please - Weird spots growing

[EnziPower]

First of all, sorry for my poor english!

Strain: Strawberry Cough
Light: 400 sodium 18/6
Water: I give her water every 5 days, the 03/04 i gave her a little bit of vegetative stimulator and mycorrhizae and the 08/04 also a little bit of vegetative stimulator (it was looking pale but i think now its because of this spots) and roots stimulator. between 700ml and 900ml.
Pot: 3LT.
Lifetime: 29 days.

Hello, im wondering if someone could help me with this, it have been happening for a couple of weeks now and its getting worst.
The top leaves slowly are starting to have some gray spots also. This is my second growth and i dont have much idea of what is happening but to me it looks like fungus, maybe?
I have three other plants and they are very healthy overall, i spoted a tiny gray spot also in the leaf of another plant that was also touching one leaf of this one.

Any help would be much appreciated

 

[iwltfum]

Looks like a classic phosphorus deficiency to me. Does your veg stimulator have any phosphorus in it?

 

[EnziPower]

Yes, it does have phosphorus, im not sure how much. I bought this products to some guys that where starting their own brand, in the last growth they work pretty well, but i should change to some more specific products.
Do you think that a phosphorus defficiency could hit that hard at this stage?

 

[iwltfum]

Yes, it does have phosphorus, im not sure how much. I bought this products to some guys that where starting their own brand, in the last growth they work pretty well, but i should change to some more specific products.
Do you think that a phosphorus defficiency could hit that hard at this stage?

I would ask them and send them pictures if you still have their contact info. any kind of problems like that will slow growth down to a crawl (if not a complete stand-still) until you sort it out.

 

[EnziPower]

I will, but the other plants doesnt present this issue and they are more or less into the same schedule with the same products. Im not sure if i could get in touch with them. you think if i switch to another product it could make a difference with this?

 

[Sejd2131]

I would add 1 tsp of ESPSOM SALT per gallon net time i water my plant and see what transpires...