Problems getting plants past the first couple weeks

A question from a fellow grower:

I’m wondering if you can help me. I’m having problems getting my plants past the first couple weeks. My setup is a basic bubbler hydro system w/a 300watt lED light. I germinate the seed with no problems. I have heard not to feed the plant for the first couple weeks so I wait at least until week two and then feed about a tsp of Fox Farm big bloom in 2 gallons of water. My ph is right at 6.0. Within 48 hours the plant turns yellow and pretty much stops growing. I noticed this time right before I fed it the leaves started turning yellow. Is that related to low oxygen in the water? Any suggestions would be great.

Hey there, I think you need to Use a grow fertilizer before the big bloom. Like the fox farm hydro grow big it has a 3-2-6 rating while the big bloom is 0.01- 0.3 -0.7 But I don’t do hydro so wait till Mac or Latewood or someone else to help some more.

Your ppm is way off , hydro is very precised on ppm , ph , and temperature is a big factor for chelation .