New Grower COCO and Rhizotonic

[SensiDilla]

Hi
I am experiencing slow growth with my seedlings using coco and perlite. (60/40).
You can check my other post My First Grow - Cream Caramel if you want more information.
Anyway, just wanted to know if anybody using coco for germination without any added nutrients has experienced significant slower growth compared to these watered with a light rhizotonic conc. from sprout.
I only used a very low coco a and b after first set of true leaves appeared.
Seedlings are healthy, but small.
Thinking to buy this product, but it is a bit pricey.
Let me know if you think is worth it.
Or if you know cheaper alternatives.

 

[illbethere]

might need some nutes? not every plant grows at the same rate. Do you have some pics?

 

[SensiDilla]

might need some nutes? not every plant grows at the same rate. Do you have some pics?

here is my post with pictures https://www.autoflower.org/f44/first-grow-cream-caramel-41402.html . i gave them nutes, coco a and b 1/8 of power since week 1. just slow growth. maybe over watering.