The speckles look like flying insect damage. Yellow sticky traps are excellent.

pH 6.0 is a touch low for soil. The dark, brittle leaf damage is consistent with that. Go back to 6.5.

In the future, avoid transplanting when your plants are already showing signs of stress unless you know you have to get them out of the old pot FAST for some reason (bad dirt, rootbound).
stinkyattic Reviewed by stinkyattic on . HELP Leaves yellow spots and shriviling w/Pics My plants are showings signs of 2 problems, they may be related or not? MY INFO 32 days since germination Watering with soak and let dry method, and have just started to bring down the pH to 6.0 (with last watering), NO NUTRUIENTS USED YET Using 400 watt mh Sun System1, keeping light about 2 1/2 feet above tops, dererminded this distance by heat on hand (had it closer first day) Changed from Floresents to Metal Hal (3 days ago) 18 hours daylight, 6 hours dark Temp is 87 and Humidity Rating: 5