help me plants ill (pics)

me plant is a bit ill the other two are mint like but this ones got sumit wrong with it, mabyes nitrogen im growing in doors with soil form me compost bin their in veg, i topped this plant 1 week ago and i feed one every two weeks with this:

vitax Organic Liquid Seaweed

A concentrated liquid seaweed extract for healthy growth of plants, flowers and vegetables.Regular use of Organic Liquid Seaweed will help plants withstand environmental stress, pest and disease attack.
Use as a liquid root drench or foliar spray on flowers, fruit, vegetables, shrubs and trees.
Apply: In the spring and throughout the growing season
How to Use:

• Measure the amount of liquid seaweed required, mix with water and stir well.
• Apply using a watering can, fine sprayer or hose-end dilutor.

Available pack size

• 500ml
• 1 litre

this is the plant:

also this plant is 41 days old and the veins on the top fan leaves have turned red, the stain is ?......bagseed

any help would be bless

cheers

some one help please

I did some research on Vitax and found that the bottle doesn't tell the ingrediants nor the npk, only talks about what the product can do for you. One thing that was mentioned was the ph of Vitax (Adobe, product saftey link): ph 5.5. My knowledgable guess is that Vitax does not have what your plants need. And at 41 days in the same soil, by now the soil has been leeched of all its goodness buy the plant and waterings.

I don't know what you have access to in your area when it comes to plant nutes, but they need to eat. I'd say get new soil and transplant into that for now see how they do. Once they recover you should consider going to flower.

cheers for being to only out of 60 oddpeople to try helping me, aye av found out that the seaweed is a vitamin/mineral suppliment for healthy growth.

i bought some terra vega nutes from canna, gonna start fedding did one yesterday hopefully it'll get better