Yellowing on seedlings

Hello all. I am a first time grower here and I was hoping someone can point me in the right direction. My seedlings seem to be growing, but I have noticed yellowing of the leaves on two of them. One also looks rippled. I have read this may be a magnesium deficiency, but I am not sure whether it is, and which action to take if so. Any input is appreciated.

I have pictures if someone knows an easy way to get them here. Either they need to be a maximum width of 800px (which every decent camera exceeds, and it's a pain to resize them) or I have to host them elsewhere, which is also a pain. If there is an easy way that would be great.

UPDATE: Attached pix on follow up post

use your mobile i used my iphone to post them earlier.i got similar problems myself ive posted some pictures today

this a picture of my little problem with yellowing i have no idea why mine have done this cos i havent over fed and ive used all mix soil wich has nutrients in it its about 5 weeks from seed and they're big buddha chiesel. help!!!!!!!! oh yeh ive also got a white widow cross and a bluberry and they havent got anyyellowing on them. they are under flos at mo 24/0

Here are the resized pix. Thanks for any input!

They look like they're doing pretty good right now, I'd say they're fine. You haven't started using nutrients yet have you?

Nope. Just water at the moment.

fallingpeople said:

They look like they're doing pretty good right now, I'd say they're fine. You haven't started using nutrients yet have you?

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do your self a favour and go and get a ph testing kit and check the level of your tap water, i had very similar problems with mine after about 3/4 weeks and is still carrying on,but last night i dug out my testing kit checked my water supply and it had a ph oh 8+ im in hard water area!!!! NIGHTMARE so that seems to of affected the roots of my young ladies stopping nute uptake. whatever you do dont throw loads of feed in untill you check your ph

Thanks for the tip! I actually have a pH testing kit (for my pool) and I also bought a soil pH testing kit. I will check and post the results. Thanks!

scoobyboy said:

do your self a favour and go and get a ph testing kit and check the level of your tap water, i had very similar problems with mine after about 3/4 weeks and is still carrying on,but last night i dug out my testing kit checked my water supply and it had a ph oh 8+ im in hard water area!!!! NIGHTMARE so that seems to of affected the roots of my young ladies stopping nute uptake. whatever you do dont throw loads of feed in untill you check your ph

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ph may be the root problem, but i think i see some purple/blue color on some of the leaves

that usually points to a phosphorus issue, nute lock maybe

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