Hello everyone I have here 9 plants there OG cross with purple kush that i purchase from Ontario Seed Bank. The plants are 26 days old and I having an issue with the leaves.

I'm using tap water with a mild solution of Dyna Grow the label says use 1/2 Tsp per gallon my Res is 20 gallon. That would be 20 Tsp for 20 gallons I only use 15 Tsp im not sure if that the problem my leaves have gold and brown spots but the new growth looks fine and also I'm having leaf curling.
The PH is around 5.5 to 6.0 I dont have a digital PH meter just the bottle tube chart. The light is JR 250Watts that on 24/7 and grow media is hydroton and is water 4x in 24 hours (ie. 6am, 12pm, 6pm, 12am)
What do recommend me do thanks for the advice everyone
Also Temp stays at 75 all the times
Johnnyrex Reviewed by Johnnyrex on . NEED HELP WITH LEAVES Hello everyone I have here 9 plants there OG cross with purple kush that i purchase from Ontario Seed Bank. The plants are 26 days old and I having an issue with the leaves. I'm using tap water with a mild solution of Dyna Grow the label says use 1/2 Tsp per gallon my Res is 20 gallon. That would be 20 Tsp for 20 gallons I only use 15 Tsp im not sure if that the problem my leaves have gold and brown spots but the new growth looks fine and also I'm having leaf curling. The PH is around 5.5 Rating: 5