WATERING ISSUES

a picture of the plants would help a lot. are they into some kind of stress? they dont receive anough light? im no expert but a foto would help

@E_heroi that's my 3 plants. Do you see any issues going on? Thanks for your

Do you think I might need another light for them?

Could a number of factors but not a negative. Some plants just grow at different speeds and use more then others, every seed can grow different. Maybe the one drying faster is closer to a fan or getting better air flow. Do the other two pots drain as well as the dry one. Most important if the plants are healthy and not showing any issues I wouldn't worry about it. I use a FFOF/FFHP mix and the top of my medium with the air flow I have dries fast and gets kind of solid, I break up the top layer every couple days and also have drilled holes in the sides of my buckets. Not saying do that, just something I did so medium doesn't take 5-7 days to dry. If you want to check the run off ppm and pH to make sure your medium is range nothing wrong with that. And if it checks out ok, and there's no negative symptoms in the plant I'd let it be.