pimp juice
Member
Hey, so im running a recirculating DWC with a 600W light, a 600GPH air pump running to 4 air stones, and a res chiller. im about a month into veg with 4 fem nirvana blackjack seeds (although a lot of this time was spent trying out different systems while the plants had begun growing. I realized I would need to keep the res temperatures cool after starting the seeds, and so had been experimenting and finally am borrowing my friend's chiller for that purpose. I run the chiller with the lights basically keeping the water temp at 68F during the day and itll creep to high 70s overnight. Anyhow about a week ago i topped the plants and they had been doing just well for a few days but just last night i noticed the leaves have been developing yellow/brown spots, and lower leaves are turning completely yellow (bottom yellowing may have developed over more than just the past few days). Also occasional leaf edge upwards curl. Growth has slowed a little. Some of the plants are healthier than others. The roots on all the plants are turning a brownish-white and clumping together (the clumping may be normal). I recently upped the nutes from 350ish ppm to 500 ppm and am adding h202 every 3 days as well as sm-90 and calmag every res change (res change every other week). feeding GH Flora series Lukas formula. Res is about 30 gallons full (54 gal tote). pH kept at 6. tap water. temps reach 100F during the day due to heat exhaust from chiller and light. Let me know if I can answer any questions, but im looking for a solution to this spotting/root problems and slowed growth. Thanks.
