Do I have light burn or nutrient burn/deficiency?

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-Problem: Yellowing tips on new growth on the top of plants. Also what looks like N. toxicity.
-Medium/grow method: Soil, straight Biobizz Light, no added perlite.
-Feed and supplements used: BioTabs Starter kit, with Silicium Flash, no Orgatrex. Prepared the soil using the Just Add Water strategy except I waited until day 10 before giving them a tab. Just one tab each, broken in half. It might be worth noting that when I broke one in half a lot of it crumbled into a dust. I can't say which one of the plants got the crumbled tab.
-Water source: Tap- dechlorinated
-Strain and age: Auto Glueberry OG, 21 days.
-Climate: Day - 25 C, 50%-60% RH, Night - 20 C, 50%-60% RH
- Light used: LED, GN Telos 0006, 180W, 18/6 light schedule
-Additional info: They have been like this for about 3 days. The light was about 60 cm (maybe less) from the top of the tallest plant. It has now been raised to 70 cm. I have just been giving them water and nothing else.

Help greatly appreciated. Thanks.

Glueberry OG A, Day 21.
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Glueberry OG B, Day 21
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The two plants at the front are the Glueberry OGs (both day 21). At the back are two Colorado Cookies (day 11 and day 19). It looks like they have too much nitrogen. This is my third grow and my third time in the infirmary with N. Toxicity. It always seems to happen at the same time too, during the 3rd week. I was hoping the issue would be solved this time by switching from well water to tap. One tab instead of two. Silicium Flash instead of Orgatrex. Changed light schedule from 24/0 to 18/6. I don't know what I'm doing wrong.
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Colorado Cookies A, Day 11. I don't know, she looks bit weird.
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Colorado Cookies B, Day 19.
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Your just on the edge of over feeding so hold off for a bit,but other than that plants look great.
 
@derek420colorado You're probably right about her being over-watered. She hasn't been watered in a good few days now and the pot still has a bit of weight to it.

I've just been giving all the plants plain water since day one so there isn't a lot I can do about the overfeeding. I will wait until the problem clears up before giving them any Bio PK 5-8 or Silicium Flash.

Cheers!
 
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