tips of my oldest leaves are turning brown

dyepntbllr1

Active Member
just like it says the tips of my oldest leaves are turning brown and idk why. im using a 20 watt salt lamp and a heat lamp. the heat lamp is about a foot or more away from the plants and the salt lamp is about 3 to 4 inches depending on the plant. they get watered every 1-3 days and they get 15 hours of light and hrs without
 

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tips are where the leaves release the most toxins, it's the end of the road for the stems. if the leaves are a nice green and not curling ur fine.
 
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