1. If you are going to mix them, dry out the cyprus first; then you won't have the damp substrate mixing with dry substrate. Aspen tends to mold when damp. However, what I do is have half the vive with aspen, and half with cyprus. It's still half and half, just not mixed around altogether.
2. I sometimes put little pieces of sphagnum moss around the vive. It is quite cheap and lasts a pretty long time, and it mixes well with cyprus. You can also use it to make a shed box or damp hide! I prefer this (don't use as much of it).
3. You can use other materials besides plastic wrap. If you have a heat lamp, anything that won't catch fire would be best. I found tin foil to work well, and kept me at ease knowing it was fire resistant next to my heat lamp when I used glass tanks. Unfortunately I don't have the link you are looking for.
Best of luck!
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