Looks like your dendrobium orchids are still growing in the grower's plug. It is time to repot. The material around the roots is breaking down and will eventually cause your orchids roots to rot.
Dendrobiums will need much more light than your phals. They have p-bulbs so they store water and will need to completely dry out between watering - unlike your phals that like to be a tiny bit damp all the time.
If you need advice on repotting, I have a video here in the forum that takes a dendrobium keiki and pots it up in an orchid bark mix. You can find it also on the RVO Orchid Care Pages.