The new growth of Dendrobium spectabile has white leave tips. Pretty healthy otherwise, no bugs. I do believe i don't water it enough. The medium is mixed bark and sponge rock - no moss. I water once a week. I just started watering it twice because of the white leaf tips. Also, i wasn't sure if this is what the normal leaf growth looks like or its a problem. Roots look healthy to me in the clear container it is in.