New to the plant lifestyle and I have 2 anthuriums that are struggling in my cabinet. I briefly removed them from the cabinet for the purposes of these photos. They are both in little 3 inch nursery pots from the original growers I purchased them from. They have yellowing/browning spots on the tip or edge of the leaves pictured. All other leaves on these plants are unaffected and new leaves continue to sprout on both plants. The environment in my cabinet is 25-29 degrees Celsius. It’s already getting up to the mid 40s in the PNW so I’m doing the best I can to combat that without depleting the humidity indoors. Humidity ranges from 70-80%. There is one 5W barrina LED 5000k full spectrum grow light on each shelf, they are on strict 12 hour timers. The substrate the plants are in is mainly sphagnum moss and perlite, per the original growers. I currently water when the moss gets dry on top but not bone dry throughout, and the plant begins to feel very light when I pick it up. Given the humidity in the cabinets, they’re drying slower than plants of the same size out in our main plant room so watering right now is usually every 4-5 days. In the plant I tagged you can see how the yellowing wasn’t as pronounced a week or so ago but now has spread. I desperately want to understand what is happening so I can resolve the underlying issue. My internet research has been unhelpful and best and contradictory at worst. I’ve tried giving them more light, then I tried less light, then I tried watering less, then I tried increasing the humidity. All to no avail and the spreading continues unabated. I’m sad to watch these otherwise healthy leaves (minor cosmetic damage otherwise) slowly wither away. Any help or insight is appreciated!!!