My plants seem to be growing slow???

Like was said already....in such a big pot for a seedling they will grow roots south until they bottom out and then they will start growing above the soil . No big deal unless... salt has built up in the pot in all that extra soil. When the roots hit that you might get some more slow growth...happened to me...

How long you think untill root meet the bottom? Hope not too long

Quick update... been at the beach today as it was scorching here in the UK today. Soon as I got home I checked the temps of my grow room and it had reached 100f at some point today so I rushed to check my baby's and I was shocked they seem to have exploded in growth from yesturday.

These are only 19 days old from germination.

Up up & away.

OK quick update.. I think the plant roots have found the bottom of the pot now as they are starting to take off now with plenty of branching out. The lower branches are nearly level with the top of the plant I'm not sure if that's a good thing or not.