Do these signs mean anything?

Hey all, it has been about two weeks since I’ve had to ask any questions on here and my plants have definitely grown and survived me splitting their stalks. Now I have a couple new issues.

1. I’m starting to see purple on some branches.
2. Tips of leaves look a little burnt. This is in newer leaves and older leaves.
3. Light green coloring starting to take over leaves that are on the top of the plant.

Some notes:
-Plants are 43 days old today.
-I know my plants look droopy, that’s because they need to be watered today.
-5 days ago I watered each plant with 1tsp of cal-mag in 1 gallon of water. Approx 6.6 pH
-11 days ago I fed plants using the fox farm trio schedule. Approx 6.5 pH and 660ppm
-My plants are in 5 gallon pots in ocean forest soil.

Hi mate it’s looking like you have nutrition burn which is causing the tips to burn. This is what’s causing the plant to stress and the stems to go purple (also can happen if you’re under LED lights). And to your last point about the growth changing colour that’s down to nitrogen, normally comes as pair when you have nute burn you experience nitrogen issues. Hope this helps you out mate

Cottam97 said:

Hi mate it’s looking like you have nutrition burn which is causing the tips to burn. This is what’s causing the plant to stress and the stems to go purple (also can happen if you’re under LED lights). And to your last point about the growth changing colour that’s down to nitrogen, normally comes as pair when you have nute burn you experience nitrogen issues. Hope this helps you out mate

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That was helpful. Thank u. Can u tell me what’s the connection with the LEDs? I am using LED lights.

OMG_Reptar said:

That was helpful. Thank u. Can u tell me what’s the connection with the LEDs? I am using LED lights.

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No worries mate and yeah I’ll give you the best insight I can and know but I ain’t an expert of any sort.. For those with LED lighting systems containing UV light, the purpling of the stems and petioles is completely normal, and is solely an expression of pigmentation, usually displayed by plants that will express purples and reds in late flower during maturity. Having said that, If you are using an LED that does not contain any UV LEDs in, then you more than likely have a deficiency.
Petioles completely change from green to purple means Insufficient amounts of Magnesium (Mg) whereas, main stem has slight pink/purple striping meaning Insufficient amounts of Potassium (K). Also just another little note on the purple stem thing it is completely normal for it if you’re running a purple strain. Hopefully this sheds a little light onto the matter for you mate