Hi guys.. ive noticed some rusty coloured spots on one of the plants I have. They’re only on the one plant and only on the top few leafs. Ive attached a photo.

Hello everyone, i have two plants two weeks into flower... a gelato 33 which is doing just fine!!! and a green ninja which has started showing some signs of a problem that I need some advice on please. the ninja’s leaves started to curl down at the tips which I noticed this morning...upon checking them tonight the leaves are completely curling down...I thought it could be one of two things, and thought peeps on here might be able to help me pretty please... basically my ph pen died yesterday! It won’t calibrate anymore so I think the readings are completely off! (I’ve ordered a new one and will be here by Sunday). This morning I had to reluctantly guestimate my water ph as my ninja was in desperate need of water...so I’m thinking incorrect water ph may be causing leaves to curl down.... OR... the plants a bushy beast! In a 3 gallon pot and I can see fair amount of roots underneath via the drainage holes...so thought it might possibly be root bound?? Temps are constantly 26-27 degrees Celsius with lights on....21.5-23 degrees Celsius lights off...with a tower fan and clip on fan moving air around so I don’t think it’s heat stress.... Advice massively appreciated!!!!!

Hey All, This is a first time grow. I have 3 plants in a 60cm x 60cm set up. They are Purple Bud from Sensi Seed. Size of strain is meant to be small (so suitable for the compact area). Since first germination to today it has been 43 Days. Grown in soil medium, approx 20 litres. LED 400W The plants are on a 18/ 8 light cycle. Temperature 20-25 celcius (25 day, 20 night); constant CF extraction and a small fan blowing indirectly at one of the sides of the grow tent. Relative Humidity is 55% They were given Nutirents for the first time 1 week ago (only for 3-4 days) PH has been constant at 6.2. I wasn't happy with the nutrients and became worried that they were getting nitrogen toxicity, there was also some tiny yellow/ brown dots appearing on a few leaves; so I dumped the resevoir and flushed them out with PH6.2. They started to go very yellow. The number of spots increased, and then the size of them grew. Since the flush, I have limited their watering, but given them a small amount with nutrients again (this has improved their colour). I have also pulled up the lights, although it was always 18 inches away. I removed a C02 bag that I put in there around the same time as the Nutes. I have also become worried that this could be a pest problem > I have been unable to find any pests (top and underneath of leaves). Attached are some photos of the plants, and close ups of one of the leaves. Any advice would be welcome. I have some mite spray on hand, should this been the diagnosis. Slysir.