Seedling leaf problem help! Any ideas appreciated

[BUSHYBUD]

Hi,

This is my third grow, these are lemon kush seedings 2 weeks old. Growing in mix of about 70% coco. 20% compost and 10% perlite. Water is rain water.

I have two seedlings that are beginning to look unwell and 2 that look fine.
Both have been feed lightly with blood fish and bone and watered lightly this week.

Two are developing signs of issues in growth anyone got any ideas of what's going on with them before I try taking some action to bring them round.

 

[GNick55]

Hi,

This is my third grow, these are lemon kush seedings 2 weeks old. Growing in mix of about 70% coco. 20% compost and 10% perlite. Water is rain water.

I have two seedlings that are beginning to look unwell and 2 that look fine.
Both have been feed lightly with blood fish and bone and watered lightly this week.

Two are developing signs of issues in growth anyone got any ideas of what's going on with them before I try taking some action to bring them round.

kinda looks like a calmg deficiency? but i’m guessing as i haven’t grown with coco, so wait for a coco grower to help out..
answering your thread will bump it up.,

 

[OldManGrower]

I am not familiar with coco. I grow in soil but agree that it looks like a cal-mag deficiency. I used to grow without cal-mag thinking that my house water had enough cal-mag. Then realized that my water softener was removing it. I usually buy clones and use a root enhancer nutrient for the first 2 weeks after planting my clones. It helps promote root growth and works very well.