Calcium deficiency or fungus??

Seems to be getting worse.. brown marks getting bigger. And more of them :-(

I would try to spray with Calcium Boron. Feeding to root won't get these immobile nutrients to old leaves. But since you are in flowering already, you can just ignore the dead leaves and spray with Calcium Magnesium instead. Cheers,

Ph is 5.8. PPM is 800. Runoff. Ph is 6. PPM is 600

Check the ph. My friend had exact same probleme i had to go tobis house and check everything for him. Water from tap. Ec. Ppm. And adjust is feeding acording to is soil ph.. aftervtesting soil.. soil testin isen't hard... Take a few samples 5-6 sample(5 inch deep or lower around the edge . Mix it together. Add 100ml of 7.0 ph in a beaker. And add the soil mix to the beaker till its about equal to 150ml. 2 part water to 1 part soil. Stir it well and test the ph and the Ec or ppm... You'll have a general idea of what is in your soil at neutral level.. you can also do one with feeding solution and on with watering solution.. this way you can really adjust the ph of your watering and feeding according to how your soil will react to it... Feeding in a tight ph ratio according to what people suggest dosen't always work for this reason many people change the ph (fluctuation) when growing in soil... After you have dialed in your ph to your plants soecific needs you can start looking into nutrient problemes. . Remember in soil calcium abd magnesium more availlable at higher ph 6.5+ so if runs off ir soil test puts you bellow the 6.0 mark it can keave you under the imoression that you have a defficiency... When in fact you don't and adding more disen't make it mire availlable either... Always check one probleme at time. Make a big watering (complete drench with excessif run off with normal feeding solution you would like to have and proper ph along with 25ml if hydrogene oeroxyde per liter of solution. Abd floid the plant... The hydrogen oeroxyde will prevent overwatering by giving oxygen to the roots and the feeding will balance the soil to a more accurate ph and ec level.. unfortunatly none of the leaf affected will come back.. they will all die.. you can cut the dead tissue or remove the leafs after you have fixed the issues

What is your ph..