Hi all. I've got a homalomena emerald gem under the following conditions:

1. Soil: mix of peat moss, coco coir, perlite, pumice and some vermiculite - drains decently

2. Sits near the window, medium sun

3. Gets watered once week depending on how the soil feels

4. I live in Asia and it's humid all year round

The plant seems a bit tantrumy. Either the leaves go full yellow or brown spots/edges appear. Is this a watering issue? I haven't fertilised this plant yet. Any help would be appreciated! Thank you