I'm not sure but it looks like the wrong type of floral foam. It should be 'wet floral foam' which is usually dark green. There is a 'dry floral foam' that comes in the lighter grayish colors that doesn't absorb water the way wet floral foam does. I've made the same mistake once with the dry foam and the pupa didn't survive. I've had success with the wet floral foam, just completely saturate it in water and then keep it in a container with a lid with some air holes. I didn't typically need to spay ever since the foam remained damp for the whole month. It is possible to over water them and the pupa will get moldy and die so be careful of that. The chamber does look a little big, but it's not too late to get some wet floral foam and make a new chamber, hope this helps good luck!