suspected calcium deficiency

i looked around the web and the best i can figure is calcium/magnesium deficiency just wanted to get a couple more opinions on it the plant overall looks healthy just some of the older under growth is doing this.
I attached a pic of some of the leaves and one of the plants

Looks like a mag deficiency a calcium deficiency is very easy to distinguish from other types of deficiencies. A calcium deficiency shows up as rust colored freckles and are fully visible before the leaf even turns green.

I thought it might be cal or mag def but after further looking its actually the veins turning yellow not in between them like a mag def. I am using sunshine #4 and have adjusting ph to around 6.5 I borrowed a friends soil ph tester he actually has a good one not a $5 Home Depot one and my soil ph was at 5.4 I added lime and flushed with 6.5 water the runoff came out at 5.6. Hopefully with a couple more waterings and more lime I will get the ph sorted out and all will be well. Thank you for the reply

That's a tough one if it was on top I'd say it was a iron deficiency. I've heard of pythium and other root diseases causing yellowing of the veins but I don't know if that's the problem here. Are you growing in soil or hydro?

Soil it's sunshine #4 in 5 gal pots and I'm using house and garden nutes switched to flower 2 weeks ago started flowering about a week ago they are under 2 1000w hps.

slim83 said:

Soil it's sunshine #4 in 5 gal pots and I'm using house and garden nutes switched to flower 2 weeks ago started flowering about a week ago they are under 2 1000w hps.

Click to expand...

I don't know man h&g are some good nutes I've had great results with h&g aquaflakes in my drip systems. In that second pic it looks like there's discoloration at the tops of the plants closest to the bottom of the pic. That actually does look like a iron deficiency but it may be the hps lightning I can't be sure can you get a pic with some daylight cfls or something?

I found a old thread where someone appears to be having a situation like yours. Do your leaves look like any of the ones in the diagram?
https://www.rollitup.org/marijuana-plant-problems/467073-yellowing-veins-only-rest-green.html

I have looked at that chart and googled for hours trying to figure it out befor I asked on here I found a couple people with the same issue but no remedy for it or what the cause was. I flushed added lime and mag as I think it was a ph issue. I have done about 6 grows with this strain I have it dialed in pretty good never had a issue with it the only difference with this grow is I reused my soil and was to lazy to amend the soil and I think my ph was fluctuating to much locking out a lot of things so hopefully all will be well soon if not I will chop and cut more clones and start over with fresh soil.