Addicted Philip brown leaf tip

[Dimkarydis]

Hi everyone,
I have recently found this forum and, as a new keen orchid grower, I am thrilled with the information I can find here!
I am wondering whether you could advise on what happens to my addicted Philip paph, as one of the older leaves has turned yellowish with a brown-red tip. I have a new growth on this plant and I really hope this is not something serious, as I am looking forward to see it flower.
I grow it in east windowsill, on the warm side, water once a week and fertilise once a month.
Any advise please?

[Ray]

That could be normal leaf senescence, but how fresh is the medium?

[Dimkarydis]

It's in graded bark and coconut fibre chips. I repotted it 7 months ago

[Dimkarydis]

I attach a closer photo

[billc]

Looks like the oldest leaf is just dieing off.

Bill

[King_of_orchid_growing:)]

When in doubt, check the roots.