Seedlings with yellow veins

[tonas]

Hello guys,

I am new on this forum, so first thank you very much to be part of this community.

I began to grow cannabis during February this year. Back in past I grow just outdoor plants which are easy. Now I begin with indoor growing.

I have one big issue, which looks very difficult to solve. I already killed around 7 cannabis seedlings (germination 100% success). Little plants always show up yellowish veins in top new leaves. Usually this issue appears after 7-14 days of growing. Please see pictures below. Plants stop growing and they are basically dead. I already tried to do:

• Grow with fertilizer (biobizz grow) - guy from local growshop give me this advice
• Grow without any fertilizer = just water + biobizz root juice

PH in tap water (7.5) is always measured and corrected for 6.2 - 6.3 (using Ph down by Biobizz).
Medium is Biobizz light mix to prevent nutrients excess.
Light is LED Lumatek Pro 200W - now it is running on 25% which is something around 50W. Light cycle 20/4.

It is very desperate situation. 7.4.2022 I planted next three plants, which I water with water from different city (I live in city that takes water from underground - so I thought it is maybe reason of my issue - we will see what will happen in next days).

Could someone please help me? I would be very appreciated. If you would need more information, please let me know - I am glad to provide them.

Many Thanks,
Tonas

 

[Emilya Green]

Hello guys,

I am new on this forum, so first thank you very much to be part of this community.

I began to grow cannabis during February this year. Back in past I grow just outdoor plants which are easy. Now I begin with indoor growing.

I have one big issue, which looks very difficult to solve. I already killed around 7 cannabis seedlings (germination 100% success). Little plants always show up yellowish veins in top new leaves. Usually this issue appears after 7-14 days of growing. Please see pictures below. Plants stop growing and they are basically dead. I already tried to do:

• Grow with fertilizer (biobizz grow) - guy from local growshop give me this advice
• Grow without any fertilizer = just water + biobizz root juice

PH in tap water (7.5) is always measured and corrected for 6.2 - 6.3 (using Ph down by Biobizz).
Medium is Biobizz light mix to prevent nutrients excess.
Light is LED Lumatek Pro 200W - now it is running on 25% which is something around 50W. Light cycle 20/4.

It is very desperate situation. 7.4.2022 I planted next three plants, which I water with water from different city (I live in city that takes water from underground - so I thought it is maybe reason of my issue - we will see what will happen in next days).

Could someone please help me? I would be very appreciated. If you would need more information, please let me know - I am glad to provide them.

Many Thanks,
Tonas

Welcome to the forum @tonas !
Are you adjusting your pH before or after adding your nutes to the mix? Are you alternating feeding and giving plain water? Are you watering too often, before the plants have dried out all the way to the bottom and the containers feel light as a feather?