I noticed on my Basjoo and Ice Cream plants, the leaves are growing out, and after a while have brown edges. Is this normal? There seems to be a new leaf produced every 7 - 10 days. My Dwarf Cavendish is a bit slower, but doesnot have the browning on the leaves as bad as the others.

All of my plants are in pots indoors, and approx 20 - 25 cm tall.