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Best thing if at all possible is to get that ballast outside the door to cut down on some heat. A 400 watt bulb with no ventilation is going to...
I would not worry about upward growth yet. The plants are in the stage of building a strong root system for the most nutrient uptake. After two...
First and major problem is what you said. You must learn what TDS is and monitor daily along with ph. You can get a decent cheap TDS meter off eBay.
Never too much light
Definitely looks like calcium deficiency. I would suggest using Botanicare Cal-Mag. I started having this problem and I used at 1/4 tsp per gallon...