thank you Jean! Usually just stick my finger in the dirt to see if the top layer is dry and then water it if is! To water I stick it in the shower and fill it and let it drain a couple times. At first I was using plain old tap water straight from the faucet but then I read that the chlorine could be harmful so I started leaving the water out over night and doing it that way! It's sitting across from a east facing window it gets some pretty bright sunlight every morning until about 12-1.

The plant needs more light. It's too far from the window. When leaves fall out because the base is brown and soft, the problem is likely to be excessively wet potting mix. You said you water when the surface is dry. How far down is it dry? Stop using fertilizer for now.

I would move it to a brighter, sunnier location. Only the green sections of each leaf contains chlorophyll, which means that only those sections are carrying out photosynthesis. Those white variegated sections of the leaves do not. This means that only the green sections are supporting the needs of the whole entire leaf. If they're not getting enough sunlight, then they're not producing enough food to support those variegated sections. So they're dying back, rather than trying to sustain the whole entire leaf that is consuming more food than it can produce. Give it more sunlight and it will produce more food for itself.

Yours is slightly larger than mine. Mine is my first and I got it at a nursery in early June. I really like it. To me, the marks on your leaves look like shipping damage from the leaves being bent too much. The younger leaves yellowing could be just from acclimation to your new environment. The leaves pulling out and the new leaves that appear to fall apart - I am not sure what that could be. It probably all began with the lack of drainage you mentioned. Fungus gnats love moist unventilated indoor soil. I used to have a lot inside in the winter and none now in the summer. Others on this board can give you some more help than me. I've had a few indoor plants that began dying in early Spring. Then when I placed them outdoors and in the ground they ALL perked up. My banana had several treatments of copper fungicide even after being planted in the ground. It's beginning to look nice. Back to my M. Deliciosa - I place it outdoors almost daily in dappled sun and never in the wind. It's doing well. No issues. I bring it in when windy or if rain is eminent. I also back off the water. I only water when I can detect dryness by sticking my finger 1" into the soil. It's hard for me to not water like I do other plants. But I know they have aerial roots in their natural habitat and climb up trees. So their roots are exposed to the air. Here's mine when I got it on June 10: https://st.hzcdn.com/simgs/48e2ed860b1dde23_9-4068/home-design.jpg And here it is outside tonight - 3 new leaves have opened since buying it. It still bothers me to see the soil that dry. Those flipped over chairs around them filter the sun they get: (on left is Philo. 'Brasil, center is Pothos Epipremnum aureum 'Manjula')