are my plants ok? curling and turning yellow

hey guys, just wondering if my plants are safe enough for the time being, im not a very experienced grower, this is my second time and i really only do it cuz thers so much shit grass out there and its a rip off!

their lowryder 2 plants,
about 5 1/2 weeks old so 3 weeks left till harvest,
im using a HPS High Pressure Sodium - 250 watt light,
im not sure about the ph of soil or water cuz i cant get my hands on a tester right now,

I would water them every other day and feed them twice a week with IONIC Soil Bloom, I know for the size of my light i can only yeild so much but i have 6 plants and 2 of them are curling upwards and down loads with bottom leaves going yellow to brown and the other 4 look healthy enough with the exception of a few yellow bottom leaves, am i doing anything wrong with the other 2?
heres a few fotos. any advice is well appreciated, thanks

wow they could a combination for nutrient burnt and too hot or too cold.

Flush them with Ph balanced water and look into toxic build up?

Don't worry your plants are fine! I'm not seeing any burning on them (a few yellow leaves is ok) and the curling is a heat issue....how dry is your soil after 24 hours?

Hey i am not a genius, nut if u have proper drainage you should be watering them more often, as they show signs of under or over watering, and as its only watered every second day.. then i wold assume underwatered.. ph isnt a big deal in soil for u guys.

well after 24 hours the soil is still damp, the drainage shouldnt be a problem cuz all my pots are sitting on soil itself (maybe its cought a diseise from the bottom soil cuz i used soil from my garden to cover a large area?), theres only 1 or 2 burn marks on them but they where there from before the plant started curling, i dont think its due to the room bein to hot cus ther outside in my shed and a good enough breeze flows through, if it was to cold would my other plants not curl up 2? very confusing lol, thanks billions