Calcium deficiency

It's an indoor grow. On my flowering plants, I've been dealing with medium to severe calcium deficiency. Slow, to no growth, leaves bending, have brown dots on them, stems are weak, definitely looks like calcium deficiency. They look quite awful, like nothing i've seen before. I've flushed all of them, and tested the soil ph, ph is around 6.9-7.0. What's going on?
Now I recently planted some more seeds, and they're maybe 2 weeks old, and already showing signs of calcium deficiency as well. I've tested the ph of those, and they also come up around 7.0. The way I tested ph was with a fishtank water tester. Mixed the soil from a few spots with some 7.0 water, let it sit, and then used the clear water for the test. Maybe I'm testing wrong, I know the water test isn't the best thing, but that's all I have right now.

Help?

I'm a hobby grower, mostly growing because it's interesting, so I'm not spending a lot of money on it, but in the past few grows I had everything was fine, except I used miracle gro indoor soil.
soil - miracle gro garden soil(.15-.05-.10)
nutes - the only things i've ever used were bonemeal in the soil(12-0-0), and miracle gro all purpose plant food(24-8-16) for veg, and african violet plus(8-14-9) for flowering. On flowering, I stopped using nutes all together since the problem got severe.
lights - clfs
growbox temp - 78 degrees, humidity 30-40%

this is about a month and a half into flowering

and this is the 2 week old veg, haven't used miracle gro on them yet

looks rootbound to me...giving shots of the entire plant helps...but 2 weeks into veg and still in a party cup looks pretty apparent to me that its rootbound at least on that one picture...

If you mix a bit of dolomite lime (powdered) into your soil before planting/transplanting, you will have no worries about calcium, magnesium or pH. It's nice that way because when/if symptoms of a deficiency appear, you know it's something else. cn

they have good drainage, roots aren't sticking out the bottom yet, and i've usually kept them in party cups for a month and they've looked fine.
here's more pictures:

I wouldn't keep them in a party cup passed 2 weeks. Also Them flowering ladies look almost dead. All plants look like nute burn possibly? Anyone else think so?

djlifeline said:

I wouldn't keep them in a party cup passed 2 weeks. Also Them flowering ladies look almost dead. All plants look like nute burn possibly? Anyone else think so?

Click to expand...

yes... Some burn and i c u use different nuts?!

That is a big plant for such a small cup... I transplant when they are about 6 inches tall

the veg are barely 3 inches tall at most, the flowering are in big flowerpots

With the smaller plants, I'd just say that the MG soil is too hot. I'd say to try a different soil.

But they look way to small to be rootbound in there to me.