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The leaves with damage on one side are displaying a symptom of Phosphorus deficiency. The yellowish new growth looks like it may be a symptom of cold nights. Check the soil pH if you haven't yet.

It depends on the type of plant. There are leafy indicas that need alot of N and there are sativas that don't. Something close to 3-5-6 is usually a good place to start.

Looks like Calcium & Magnesium deficiency for starters. There may be some P &/or K def there as well but it's hard to say for sure.

The Bat Guano suggested by Bub would work well, as would a Seabird Guano that's high in N &/or P. Guanos and most solid organic ferts are time-release fertilizers that get mixed into the soil unless they are made into a tea before using. Once made into teas, solid slow-release ferts become...

You want a greenhouse.

We haven't seen that before and since it doesn't list what it's made of, we can't say anything about it. Nothing jumps out as being unhealthy for the plants, though. Even the pH looks kosher.

It's Nitrogen deficiency and there's some Phosphorus def there as well. When you fix the problem, the damaged leaves won't heal. The best you can expect is that it doesn't spread to other leaves.

It's nothing definite but the way this statement sounds makes us wonder if perhaps you're overwatering a little. It shouldn't be the cause of your main issues but it's something to consider. Watering cycles should go from the soil dripping a few drops when a handful is squeezed (& that damp all...

Will it work? If you mean will it give the plants the NPK ratio shown on the bottle, then probably yes. If you mean will it supply everything your plants need, then probably no.

If you train the plant around the pot before any cutting, you can top any shoots growing vertically and leave one node behind on each. This splits each shoot into two shoots. If you top before training around the pot, you could chop off everything but the lowest growing node. That node will grow...

Yeah the first looks that way, which is why we brought up the soil. A quick flush would of course thin out the soil. We think the latter two are passed any problem with fertile soil, though. Pull one or two out of their cups and see how the roots are. Some strains are rootier than others and...

Stopped? You mean all are plants that haven't grown further than in the pics? How long have they been stalled? The first pic may not be ready but the second two are at the point where they should be transplanted into larger containers of nutritious soil. Their roots may be starting to swirl at...

No leaf yellowing is "normal." Some growers hold back on the Nitrogen during flowering, but then the yellowing is intentional and the plants would be healthier if they were fed enough to stay green. Your plants at least were N deficient because the Flora Bloom has no Nitrogen. They aren't going...

Whatever the main problem is, it sounds like a macro deficiency and so the CalMag won't fix it. Once you post pics, people should be able to tell you which macro(s) is causing it.

Well first you should keep in mind that while a 9-2-6 fertilizer isn't perfect for flowering by itself, it can certainly be used in conjunction with other ferts. Between that, the Bone Meal and the Kelp, you should have good sources of N, P, Ca, Mg, Fe and others. You don't seem to have a high-K...

The pH of the liquids you give the plants and the pH of the substrate they're growing in are two different readings. To test soil pH, you can use a probe-type meter ($15+), a capsule-type test kit (~$6) or test the runoff using a liquid pH tester. When testing runoff, allow the water to sit in...

There is certainly a problem because pH 5 water + pH 8 substrate should yield something close to 6.5. The fact that the acidic liquid showed no affect on the soil pH is reason enough to try at least an inexpensive alternative pH tester.

The NPK is a listing of how much Nitrogen, Phosphorus and Potassium that fertilizer is made up of, in percentages. A 10-10-10 fertilizer is made up of 10% N, 10% P, 10% K and 70% other stuff, before mixing with water. Different strains have different nutritional requirements, larger plants of...

Yes, pH 7.8 is way to high. Imo everyone using a pH meter should have an alternative way to test pH in order to verify that the meter is still working correctly, especially when the owner believes it to be a cheap ass meter. There are capsules, drops, strips and other cheap ways to double check...

It looks like the pH may be off. Try to check the pH of your substrate asap.