I finally got out my camera and got a picture, hoping to bring some Light to the conversation. ;-) Here's a picture of my Neon Pothos, next to a Golden Pothos for comparison. Although the Neon leaf at the bottom center of the picture is darker than the newest leaf, it still isn't as dark as the Golden Pothos. My Neon is still very young, and we haven't had much sun this winter, so I hope the colors will perk up in the spring. And just to muddy the waters further, isn't there a bright green philodendron? I'm not sure of the exact name, but I wonder how the colors mature on that one? Lennie in Michigan

I really like the color as well - here is a picture of my Den. hercoglossum, which is very similar except for the color. Maybe someone out there knows of hybrids made with D. hercoglossum. Tucker

This is 100% from not enough light. Not enough light will cause succulents to loose their pretty color, leaves will get weak. Plus other problems. If you do start giving more light. Slowly is the way to go because it will burn:).

Perlite is a volcanic rock baked at super-high temperatures to create popcorn like air pockets in it. Miracle Gro steeps theirs in fertilizer, yes, but it isn't in itself a fertilizer -- just a soil amendment to provide aeration. Since it is a rock, it discolors with exposure to the elements (water and air) and becomes a host for (healthy) microbials. Over time the perlite will turn beige and/or brown. If it turns green, you've got algae growing and are probably badly overwatering. I would second Karen's question about the pot's drainage hole and also ask about your watering habits. Are you sticking a chopstick/skewer in (all the way to the bottom) to test for dryness? Roots need air as much as they need water, which means giving the dirt a chance to get almost completely dry before drenching it again. Otherwise, you suffocate the roots and lose leaves.