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As Tommy says, If new growth is appearing they will be fine.

Some examples of Home remedies to raise/lower pH are as follows: 1.Lemon juice. 1/4 tbsp can bring a gallon of tap-water from 7.4 to 6.3. 2.Phosphoric acid. lowers pH and provides Phosphor too! 3.Nitric acid. lowers pH. 4.Hydrochloric acid. strongest way to lower pH 5.Hydrated lime. flush soil...

Looking nice, If you want a growth spurt in your roots add a little Superthrive to your feed, An EC of 0.5 sounds good, Whats your tap water EC? Give it maybe a week and up it to 0.6EC or 0.7.

Definetly some heat stress, 84F/29C is just too hot. Wether the abnormal colouring is due to heatstress I dont know, Bring your temps down to 24-25C (71-76F) and see if it goes.

Like smiley face says, It's lacking a bit of Nitrogen (N) Also, When aplants begins to flower it often 'cuts dead weight' by disgarding a few bottom leaves that have 0 access to light to concentrate energy on buds/upper leaves. What medium and nutrients are u using? EC?

I use a 400W HPS and it covers 3.5FT SQ, A 1KW HPS will cover a 5x5 area well, I wouldnt add anymore lights I would change your style of grow if your unhappy with yields.. What medium r u using?

Sounds like light leaks to me, Get rid of the hermined plant ASAP or it WILL stop all your other plants producing THC and make them start producing seeds, Check intensly for light leaks

TBH I'd just do 2 plants, no bigger than about 18 inches as the light will not penertrate that far, You could possibly get away with doing 3 plants but you would need some side lighting (cfls) for the lower leaves and round the edges, Personally id go with lowryder strains and exspect 20-40...

keep it at 20/4 thruout the whole grow.

1 guy asking if a magnifying glass between his plants and his 600W HPS would speed growth up..

Personally id put either 3 600w or 2 1000's

You could stick with the 6500k thruout the grow but your yield will be down anything upto 50-60% I think, T5 tubes ar elike £5 so I would defiently get some come flowering, If its a 8 tube maybe leave 1 or 2 blue tubes in and have 6-7 red, a little blue light in flowering is good to help with...

If you want a high yield forget soil and use Coco, Specifically Canna coco, 10-12 Plants under 2 1K lights I'd exspect around 4 oz a plant if done correctly. possbly more.

Should be ok althou 30C is a bit too hot, You want a max of 27C. For best results 25c lights on 20C-21C lights off.

40-45 RH lights off is fine, its fine for lights on too. In veg if it drops below about 35 it becomes an issue, In flowering 35-40% RH is best IMO.

Thanks for the replys guys, I will be buying some Hammerhead 9/18 after I have finished my small 250ml bottle of canna pk13/14 (waste not want not :D ). Just so I can finish off my bottle of canna pk 13/14 would it be all good to use it along side with Hesi coco bloom? (Hesi coco is part...

Think he means the main nutirents im using (Hesi) to compensate for the PPM/EC, Even thou EC meters are useless with Hesi because it has Urea in it I just go by the bottle instructions and its quality stuff.

Thanks... :)

Can I use this with Hesi coco bloom? I am currently day 13 of 12/12 and was gonna start pk 13/14 at week 5... Anyone see any problems using Canna PK 13/14 with Hesi nutrients?

Get 10 of those and ur getting somewhere, Or just get a 250W HPS and get a better yield all round.