Magnesium deficiency? (With pics!)

The leaf tips turn slightly upwards, there are a few brown leaf tips and interveinial yellowing. I'm beginning to belive this to be the case? Any other possibilities

This is Nirvana Ice by the way! ;)
 
So, I'm thinking that I'll flush these thoroughly, buy micronutes, ph-meter and a measuring cup/vial for measuring 0,5-15cl... Hmm. Pro'lly a good idea!
 
This is pH spotting. You need a pH meter for sure, and you need to test your solution.

The soil also looks really muddy. Probably not especially high quality stuff.
 
Oh, thanks! I'm a first timer, really broke and just wanted to get started!:-P

Muddy soil affects nutrient uptake, right?

What do I need to test my solution?
 
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