the soil is a 25L bag i got from focus d.i.y store it says organic blend top soil on the bag and is ideal 4 new beds and borders replacing old soil and making compost, sounds like i got the wrong stuff, bollox, and it says made with sterilised loam.
Hiya Jaymz, sorry for the delay getting back to you.
The soil you've got is not really ideal for pot plants - it's intended for use outside in gardens. What you want ideally is a basic Multi-Purpose peat based Compost with added John Innes if you can get some. The Arthur Bowers range is quite good, or try the DIY stores own brand if they do one, but stay away from anything from Miracle Gro please.
Also, while you're at it, pick up a bag of perlite, Wilkinsons do it in 5L bags for about £1.50 or so. Mix in some perlite at about 2-3 parts ratio. ie 8 parts compost to 2 parts perlite and mix it in well.
If you're in the UK, which you are, that's an uh oh and is probably what's causing your Magnesium problems. Get some distilled water or bottled mineral water and mix it at about 50/50 with your tapwater.
i got stored in a 5 gallon water dispencer bottle with my nutes mixed in at half strenght the bottle recomends 10ml to every 5L. (canna bio vega) organic.
It's not a good idea for a whole variety of reasons to store water in a container ready mixed with nutrients. Mix up your feed water (50/50 tap/distilled or whatever) each time you're ready to use it and add in the nutrients there and then - don't let it sit about.
Canna Bio Vega is fine for soil, but use it at about 1/4 strength rather than 1/2, 1/2 is probably too strong. Don't feed your plants for at least 3-4 weeks after you repot them.
have i got the right nutes and the right strenght mixed?
See above
and my soil, is it good enough.
Ditto!
when i repot do i just put it in a biger pot, and what do i do with the soil in and around the roots?
Okay, what you want to do is pot up to a slightly larger pot so you have room for more soil. Wait till the plants need their watering, so the soil is dryish and will hold together the rootball when you pull it out of the pot.
Put some newspapers down and gently squeeze the sides of the pot to release the rootball from the pot sides. Turn the plant and pot so it's horizontal, scrape off any lose soil at the top of the pot before you tip the rootball out.
Now this is the tricky part and requires some manual dexterity!
With the pot and plant horizontal, with one of your hands (depends if you're right or left handed) slip the stem near the top soil through your first and second or second and third fingers and lightly and gently hold the top of the soil, turn the pot upwards whilst holding the top of the soil in the palm of your hand and stem through fingers and gently slide the pot off - you should almost end up holding the plant upside down, as you hold the top of the soil in your hand. If the pot won't come off easily, gently poke a pencil through one of the holes on the underside and push gently that should release it. You can now gently either hold the stem firmly and place the plant bottom of the soil down on the newspaper or lightly hold it by the top of the soil and put it down that way. Try not to touch or disturb the roots at all - they're very sensitive.
Now fil your new pot with soil/perlite up to a point where the plant rootball and soil will sit on top of it and the top of the soil should be level with the top of the pot. Hold it in position whilst you fill in the sides of the pot with soil and gently push it down. Don't compact it, ie don't push it down firmly, do it lightly, the watering will compact it down.
Now you're ready to water. Add a drop of Superthrive (1 drop per 4 litres) or 1 mil per litre of Seaweed Extract if you have any to your irrigation water and saturate the plant, till about 10% runs out of the bottom of the pot. Don't go mad so 50% of it comes out - take it slowly and add it a little at a time so you only get about 10% run off - otherwise you'll just leach the nutrients from the soil.
Watch the plant for signs of improvement, if it continues to yellow those leaves and more of them, add about 1 teaspoon of epsom salts per litre of water at the next watering. You can get Epsoms from Garden Centres in packets (cheapest) or you can get it from a Chemists or Boots.
Let us know how it goes please.