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@Bashgrowsitall1989, thanks mate. Lights are about 3 feet away at the moment - due to be dropped to about 18 inches in the next day or 2.
I'm 96% sure the yellowing is from over watering. All the testing of my watering system has seen a lot more water go through than I would have liked - but yeah, it's all tinkering... and it's a lot of fun!