Does the plant in question have a new growth starting? It would be pushing up between the lowest set of leaves & the main plant. Occasionally this new growth will cause the lowest leaf to yellow.
Mine are all potted in fine grade CHC mix. It tends to hold water longer so you don't have to water as often. I'm letting mine go about 10 days between watering which might be a tad too long. So far none if them seem to mind.
The new ones from Lehua are in coarse bark because the conditions in HI are warm & humid most if the time compared to here. Media doesn't dry out nearly as fast there, so coarse bark makes perfect sense.
When you are ready to repot let me know. I have a boatload of clear pots that I am willing to share.
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