Lower leafs getting yellow tips and spots

Your plants are in tip top condition So, the issue is. She's eating the closest food source when she can't get it from the soil. So, imo, I reckon you left the soil dry up too often, no your plants don't need to be droopy to shoe this neither. Any dry period, that's the start process of your eating those leafs at the bottom for nourishment.. Just make sure to keep your soil moist. You can let it dry up yes. As that's how roots breath. When soil dries, air is drawn into the sub from that process. But u just let it go a lil too far. No real issue here. If there was any other issue than this. I'd be looking for signs up above, there's none..