Leaf problems

I'm in serious need of help right now. My girls are a month old, growing in fox farm ocean forest under led lights. I'm not 100% sure what the problem is but I need a fix asap. Out of the 4 plants I have this one is the worst. The other 3 are starting to have the brown spots as the one pictured but very faintly. Do I have both a magnesium and calcium deficiency? I had salt build up around my smart pots so I flushed them yesterday hoping it would help, but it hasnt really slowed down the spots from forming. What do I need to do to reverse this problem and keep it from coming back

need better pic white light

Dumme said:

What your water look like? Tap? RO? pH? What have you don't to fix it so far?

With the close ups, I can't see how big they are.. How many weeks? Any additives at all, so far?​

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I'm using tap water that is being balanced to 6.5-6.8. I haven't added anything yet, just simply flushed them. I ordered some dolomite lime and will try adding this to the water? Also I have epsom salt handy that I can add. They are actually going to be a month old tmrw. Here are a couple more pics

I'm leaning more towards Calcium. Get yourself some Gypsum. I see signs of Potassium deficiency too.

Time to feed them...

Dumme said:

I'm leaning more towards Calcium. Get yourself some Gypsum.

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Will dolomite lime work as well? Since I just ordered some or would they not work the same. Also I'm curious, can your tap water change pH from time to time? I had to add more pH down to get to where I needed to be.

I've had tap change, but it's really rare. If the city is working on pipes, ect..
Dolomite will effect your pH and is kinda a slow release, but could potentially help long term. I don't use it.

I'd also check you pH meter's batteries, as it's more likely the case.

This looks like a calcium deficiency to me. Hard to tell if there is a magnesium problem to due to the white lighting in the picture.Dolomite Lime works fine if you already have it. It'll supplement both deficiencies and it'll also help correct any pH problems (should one exist).

Dumme said:

I've had tap change, but it's really rare. If the city is working on pipes, ect..
Dolomite will effect your pH and is kinda a slow release, but could potentially help long term. I don't use it.

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Dumme said:

I've had tap change, but it's really rare. If the city is working on pipes, ect..
Dolomite will effect your pH and is kinda a slow release, but could potentially help long term. I don't use it.

I'd also check you pH meter's batteries, as it's more likely the case.

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This pH meter is still new. I've only been using it a month. So the batteries can't already be dying. Say I have a gallon of water and I add 25 to 27 drops of pH down to bring it to 6.8. Since my last water, I've had to at 40 drops to bring it to 6.8 which is just throwing me off.

As a hydro retailer I can tell you pH meter's die all the time, even DOA, along with the batteries. Cheaper you buy, the cheaper you get, but if your sure, your sure. Even the big name brands go. I always tell people to check out of habit; it's commonly over looked.

Dumme said:

As a hydro retailer I can tell you pH meter's die all the time, even DOA, along with the batteries. Cheaper you buy, the cheaper you get, but if your sure, your sure. Even the big name brands go. I always tell people to check out of habit; it's commonly over looked.

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Well I'm not gonna lie, it's not a top of the line pH meter. It's a Dr.meter. But I guess it would be wise to invest in something better

It might be fine. I'd test in calibration 4.0 or 7.0 before you drop any money into a new one