Need help. Is this underfeeding, lights, or something else?

[BalzarDanglin]

I've been having issues with this poor gal since early on, but trying not to give up. The yellow discolouration on the leaves is strange, and something that happened on a prior plant, which I had assumed may have been pH related, but used a fresh bag of soil and totally different nutrients this time around.

It's a Mephisto Hubbabubbahaze, which I've had plenty of success with in the past. The plant continues to have a light/sickly green colour, odd discolouration on leaves, and is generally not doing well. Usually at this stage my plants are far larger and more vigorous.

Age: 28 days from sprout
Soil: Biobizz light mix with 15% worm castings and 20% perlite added
Fertilizer: Megacrop 1 part, which I'm feeding quite lightly as I haven't used it before. I will add that I may have held off on feeding for too long to start, but even with a light feeding the tips burned a little bit.
pH: Between 6.5 and 6.7
Light: Migro aray 4 - DLI is around 20 at the moment (20/4 light schedule)

Any ideas as to what might be the issue? I'm especially interested in peoples' take on the leave discolouration and that fan leaves leaves appear to be dying off.

I really appreciate any and all insight and thank you in advance.

 

[Lil Dab]

I've been having issues with this poor gal since early on, but trying not to give up. The yellow discolouration on the leaves is strange, and something that happened on a prior plant, which I had assumed may have been pH related, but used a fresh bag of soil and totally different nutrients this time around.

It's a Mephisto Hubbabubbahaze, which I've had plenty of success with in the past. The plant continues to have a light/sickly green colour, odd discolouration on leaves, and is generally not doing well. Usually at this stage my plants are far larger and more vigorous.

Age: 28 days from sprout
Soil: Biobizz light mix with 15% worm castings and 20% perlite added
Fertilizer: Megacrop 1 part, which I'm feeding quite lightly as I haven't used it before. I will add that I may have held off on feeding for too long to start, but even with a light feeding the tips burned a little bit.
pH: Between 6.5 and 6.7
Light: Migro aray 4 - DLI is around 20 at the moment (20/4 light schedule)

Any ideas as to what might be the issue? I'm especially interested in peoples' take on the leave discolouration and that fan leaves leaves appear to be dying off.

I really appreciate any and all insight and thank you in advance.

She looks hungry how much one part are you using? I usually use MC 1 part at 4 grams per gallon plus 1 gram epsom salt per gallon then dilute to desired ppm

 

[JP1]

 

[Olderfart]

agreed, hungry. starving little girls.

 

[BII]

When I used BioBizz Light, I had to start feeding by 2 weeks - you're 4 weeks out. I don't think the worm casings boost real-time/short-term nutrient levels all that much. [I'd feed 1/2 the grow dose of MegaCrop, and give the plants full light].

 

[MesaBoogie]

Keep an eye on the outer edges of the leaves. If they start curling up anymore I'd back the light off.