Dendrobriums, Anthuriums, Alocasias

[JFoster]

I have a Dendrobrium orchid which is growing extremely well. I have a greenhouse window in my kitchen and it is grew so well - I had to split it into two plants. Both are doing well.

However, I also have an anthurium and an alocasia which are not doing well in the same location - I have moved them to a more indirect light source and they are still not doing well!! Any ideas?

Thanks.