Plants are 6 weeks old. Short Bushy and Damage marks

Hey everyone just wanted a couple of opinions on how my plants look. I have been topping them and stressing them slightly as well to try and form a plant with a little more strength. There is also a fan blowing directly down on them to also strengthen the plants for the future budding process.

Some of the leaves seem to have some damage ( I bet this is from me messing around inside the dresser with the lights and surroundings ). And they are fairly short and bushy for 6 weeks. I am not sure as to the type of plant because this is my first grow I am trying to see how the set-up works.

looks like a PH problem and what is your feeding schedule

Hmmm I'm trying to keep the ph between 5.5 and 6... Maybe ill keep a closer eye on that. They are fed for 5 minutes every hour that the lights are on.

what kind of meter do you have.. is it clean? sometimes there is build up around the probe and that can throw the ph off really bad it happend to me my plant were looking horrible when growing in coco and i thought i was watering with water that was 5.5-5.8 but since the probe was all dirty the PH was really 4.5 i found that out when i was testing my tap and it was testing at 8.2 when i know my water usually tests at 6.5-7.0. clean it and calibrate your equipment...good luck.

Thanks ill update in a few days