The other thing I've just thought of is to ensure you are watering enough.
It is important not to over water BUT it is also important not to underwater as well.
A yellowing leaf, while it could just be age, could also be an indication the plant is not getting enough water.
Not getting enough water can either be due to rotted roots (and overwaterering) or due to underwatering. As you have checked the roots that makes me think underwatering is possible.
How do you water it?
The best way to water is to either run water through the pot and out the holes in the bottom until the medium is soaked, or dunk the pot in water for a few minutes until the medium is soaked. Once you have done either of those things allow the pot to drain well and ensure it is not left standing in water.
You should do this whenever it needs it and not on a set schedule. There are several ways to tell when it needs it...
1. If you have a clear pot you can look at the roots through it. If they are green then they don't need watering. If they are silver then it is time to water again.
2. If you don't have a clear pot, then a wooden skewer can be used. Keep one pushed in to the medium, when you want to see if it needs watering pull the skewer out. If it is damp or feels cold on your cheek then it is not time to water. Once the stick comes out dry it is time to water again. Always put the skewer back in the same hole to avoid damage to the roots.
3. The third method is the most tricky and I've not got the hang of it myself. That is to feel the weight of the pot and judge if it needs watering from the weight. If it feels heavy it does not need watering, it gets lighter as the medium dries out.
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