Brownish spots on DWC seedlings

I have a seedling which is in it's 1.5 weeks of growth. They are in a 17 gallon resevoir with filtered water. I have been using General Hydroponics Flora Series (3 part) nutes and cannazyme. The nutes are at 50% strength as of today. Previously at 25%. I'm not sure if the brown spots are maybe a fungal issue or calcium deficiency. Any suggestions?

Looks like calcium as well as maybe magnesium due to the yellowish veins on the leaf.

Generic.Name said:

Looks like calcium as well as maybe magnesium due to the yellowish veins on the leaf.

Click to expand...

Thanks! I'm going to see how it does at 50% strength nutes for the next couple of days and then increase it to 75% if it still has more spots or yellow veins.

When would it be appropriate to use CALiMAGic?

Measure your PPMs/EC. 50% or 25% really only refers to your dosage, not the actual PPMs in the grow.

I pulled the flora series feed chart.. what stage are you using? If you are using the seedling stage they are recommending 2ml micro, 1 ml of grow/bloom. They say that gives you 200 - 400 ppm. If your using 25% of that you could be under 200 ppm and that is not enough for a seedling at that stage. If I were you I would be at 100% of the flora series chart and be using a cal mag around 2 ml/gl of water and your probably should fix itself. Obviously pH needs to be in range, etc. You've got your third set of leaves so I think you could be at 400 PPM no problem. Let me know how you make out..