Second grow, second leaf issues. A quick google le...

Welll, i have seen a number of " issues" in your grow. up to the 3rd week your plant looks good. then it started with lights to low, to much water, to much nutrients.( week 4 overwatering and to close to the light),,, so it goes on in the Diary....and there is no fast fixing of the problems. I would give those Plants a " new start" with anice flush... and then let her dry before you start new. Those smartpots are great, but they keep their fluids very well inside so let her dry really good. As i see no feeding chart, i can only diagnose what i see. Go slower in nutes, less water, more distance to the light

@Scrumpy it certainly isnt terminal Ive seen man worse issues than that on plants and they have made it thru to harvest albeit with less than ideal yields from the extra stress. Now for your issues I cant see what your ph is but I suspect its not at an ideal range Soil should be around 6.2-6.4 and I see your tomato feed is quite heavy on the nitrogen for a flowering plant maybe a little toxicicity happening? Give the plant a small rinse/flush with plain water ph'd to within that range I mentioned earlier then try feeding a bloom specific nutrient mix with a higher potassium and phosphorus than nitrogen ratio