Issues with Phal Bellina leaves, black edges dry?

[krienschmidt]

Hi Everyone, My next orchid issue..... I have a Phal Bellina that I don't like the looks of it's leaves. They are still firm and wavy, but also looking dry, light yellow tint and dry rough edges, even black edges in some areas. I have had the plant for 1 1/2 years, it bloomed wonderfully last year and has two nice flower spikes and flower this year, but have never had issues with the leaves before. South window, on and off sun 4 to 5 hours a day. Too much sun? Fertilizer burn? It hurts to look at those leaves, my other Bellina is perfect, they hang right next to each other. Any ideas??? As always thank you for your time and help.

Barb