Why is my plant growing so slow!!!!!!!

[GDS StonerBoy]

is it seed or clone?

im goin from seed and mine are about idk almost 1.5 months old, im using a 3 part +

have you checked ph levels?

I'm growing from seed and my ph is 6.6! Are yours any bigger than mine are? I'm really stumped on this. It may be root bound but there in a nice size pot and even if they are root bound they should've reached a larger size than this before even getting root bound.