Indoor Tomatoes look like crap, help!

I must be doing something wrong. I am getting red tomatoes (on the small side) in the end. But foilage is brown/rusty and burnt to shit. Here is what I am doing:

1. Water using RO with a small taste of cal mag. I have been watering like cannibus letting soil dry up before rewatering.
2. Nutrients using Iguana Grow and Bloom
which keeps cannibus lovely not tomatoes. I barely use the stuff at 1/4 strength inbetween plain waterings.
3. Soil- whatever the plants came in. Dont want to use my good fox forest soil.
4, Climate, indoors in tent 78-80
5. Air flow- gentle fan on them
6. Other products, I have other products I can use on them just not sure which to try....these include sensi grow, fulvex, botanicaire sweet, yucca surfactant, organic b vitamin, silica.
Any suggestions appreciated. Here is a pic of a cherry tomato plant that I have removed all the ripe fruit from so that you can see the leaves.

I would rethink #3

It looks like blight.

If those look similar to you (note the progression from tips and edges inward) then it's probably K deficiency.

+1 on the K. 1/4 strength of a weak mj nute is nowhere near enough for toms in fruit. I dont understand why you wouldnt use the good soil, makes no sense

Ok good point on he soil. I will just have to buy more for my veggies. Do you think The fruiting is depleting the potassium? Even the bloom formula I have is only a 4-3-6. So here I am thinking I am nuking them with 1/4 strength, and actually I am starving them?

If I were you, I'd just build a small batch of supersoil, it'd be water only and strong enough to support heavy feeding veggies during fruiting.
Hell I've grown a two foot bell pepper plant in a quarter gallon of cococoir with a tablespoon of kelp meal and azomite and harvested about twenty baseball sized fruits before I replanted it outside.

I second the idea that your maters need more than 1/4th strength during fruiting though. Good call on not overdosing them, but I'd ramp it up for sure.

Smokenpassout said:

Ok good point on he soil. I will just have to buy more for my veggies. Do you think The fruiting is depleting the potassium? Even the bloom formula I have is only a 4-3-6. So here I am thinking I am nuking them with 1/4 strength, and actually I am starving them?

Click to expand...

ive had good luck with miracle gro organic choice potting mix and jobes organic 4-4-4 granules...... tomatoes did great in it and my cannabis seems to love it as well

K deficient for sure. Add some kelp, ramp up the nutes. Your other items are good too.