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from what i have heard and read that happens sometimes. The very bottom leaves will die and it has nothin to do with the health of the plant. it sometimes has to do with the leaves above it blocking the lower leaves from getting enough light, but you might want to put some nitrogen in its diet to help promote its growth that is probably the problem since the rockwool has no nutritional value(nitrogen is what promotes leaf production). also 85 is way too hot, the temperature needs to be more like 70 so its okay to raise the light higher. ur plant looks pretty stocky and the plants stem looks like it is pretty thick so it wont hurt to raise the light. and you might want to try a fan to help control the temp.
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