Leaf tips pointing down in flower

Hi guys,

I’ve grown a few times but not for years and this time decided to upgrade from all my previous grows.

I’ve gone
DWC recirculating
2x 600w double ended (MH for Veg HPS for flower)
8 plants
2.4m by 1.2 tent.
Canna aqua nutes at 0.9EC currently using bloom nutes
Ph 5.7
Water cooler at 18degC
Humidity controlled 60% veg now at 50% 1.5 weeks into flower
Day temps 25degC
Night temps 18degC
10inch revolution vector EC exhaust
6inch revolution vector EC intake

Vegged for 5 weeks
Strain - Royal Cheese (fast flower)

Anyway as I said I am 1 week 3 days into flower and I’m getting a few leaf tips starting to point down and not look great. See pics can anyone help out, I’m thinking of flushing the system in case of salt build ups, I did let the system run low at one point and ph dropped to 5.0 so not sure if it’s that, also haven’t changed the water once yet. It’s hard as it’s a stealth grow and don’t get much access.

Does anyone know what it might be?

Week 4 veg


Week 5 veg


Week 6 - week 1 of flower


Week 6 - 3 days after picture above - crazy the growth in 3 days


Leaf tips pointing down


More pointing down

clawing tends to come from too much nitrogen.

Thanks for the response, it’s strange it’s happened now after swapping to flower and changing to the bloom nutes with less nitrogen, so confused

mines are exactly the same,but it is too much n.just make sure to get ph in check,maby lower dose of flower nutes even though less n in them.

Ok thanks, I think I will do a flush of the system and start fresh, I’m running at 0.9ec with base water at 0.4, didn’t think that was too high, guess these girls are not massive eaters. I’ll try 0.7ec and see how they get along. Thank a lot

Also I have another issue with only 1 of the girls, some of her lower leaves are showing signs of something not good also, any help on this one

photos with lights off would be alot better!!

Ok I will try but it’s one of the back girls and it’s a jungle in there now so hard to get in lol

Do you guys recommend taking all the large fan leaves off now and stream line them a bit or just let it grow