COCO COIR Stunted growth?

[Blowinnheavy420]

First time growing done some research and wanted to give it a try. 70/30 coco/perlite premix 2 300w led’s, temp stays in the 75-81 degrees range and humidity from 47-60 range 2 6 in clip on fans inside the tent to keep air flowing and a 4” i power inline fan 190 cfm pulling hot air out for ventilation I have it to where I just keep the bottom flaps of the tent open so the fresh air gets pulled in from the bottom until I can get a booster fan. Nutrients I’m feeding them is the general hydroponics trio flora grow/flora micro/ flora bloom Ph’d between 6.0-6.5 im watering them ph’d water between 5.5-6.0 every other 2 feedings. the plants that I started on the 12th of this month are doing better then the plants that I started on the 2nd but none of them are growing how they should imo, any advice would be great thanks for your time

[alltatup]

Do you have drainage holes in those cups? Roots need oxygen as well as water.

[Blowinnheavy420]

Yes there is I just don’t know why there not growing how they should