If moisture is a personal problem to you then I would suggest you get some "flower crystal I think that is what it is called" they sell them at florist shops, and they come in a small packet and in different colours. Blue, green, red, orange, black and clear etc. These "flower crystals" are the same thing as "water gel". My crickets loved the green coloured variety.
Super absorbent gel used for feeding insects, also used in soils, flower vase arrangement, used in diapers etc. Is called sodium polyacrylate [monomer: -CH2-CH(CO2Na)- ] polymerizing a mixture of sodium acrylate and acrylic acid.
Place the "flower crystal" beads in a 2L bottle and add water and leave it for 24 hours. Once done pour off the water and you will have nice big round gel balls, the size of a marble or even bigger. I would also suggest you pour it out through a colander strainer and give it a shake

to remove any excess water. Now go look for an old cricket tub with holes in it. I would suggest the crickets for Africa type. and pour all the water balls into the tub. I would elevate this somehow to make sure the nymphs would not get to it. This is for moisture sake alone. If you see the water gel balls decreasing in size just take the tub as is and dunk it into a bowl of water till they once again absorb enough moisture.
Here are some photo's to explain
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Water gel crystals sold in packets.
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Water gel crystals after absorbing water, note the size compared to the bead/crystal before hydrating
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Colander, a flour sieve or sifter could also be used.
As mentioned before most florists will have "flower gel crystals available" just tel them you want to decorate your vase :blink:
So that is one option. My personal option for adding more humidity "not that I need it" is using a Big ass water bowl from "pink python" sold as a water bowl for snakes

" I wash my "pool filter sand, through a home made sieve hot glued onto a big diameter PVC Pipe with a handle, to make sure it's clean. The pool filter sand is available at any hardware stores, you could even buy a small bag of sand used in fish tanks. This serves 2 purposes. 1) Add's humidity 2) My nymphs may drink as soon as they are born
I use: 94LT ENVELOP BOX R229.95 "containers with hot glued 304, 50mesh stainless steel mesh from Meshcape
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Here is the info from where I got the containers
Plasticland Centurion
Megastore
Centurion Lifestyle Centre
cnr Old JHB & Lendchen Ext
Telephone (012) 653 3821
Fax (012) 653 6337
Here is the info from where I got the mesh
www.meshcape.co.za
37 Main Rd, Eastleigh, Edenvale, 1609
PO Box 241, Edenvale, 1610
Tel : 011 609 1120
Email : sales@meshcape.co.za
Gps co-ordinates: 26° 8'12.14"S 28° 9'51.63"E
They also have branches in Cape Town, KZN, PE and Kimberley
Pink Python has a huge range of products currently here is a small list of what they make. Most of these products will be found in any pet shop.
1. Worm Dish Small
2. Calcium Skull Dish
3. Corner Water Bowl, L,M,S
4. African Caracal Skull
5. Baboon skull
6. Human skull
7. Vervet Monkey skull
8. Wood fungus
9. Bondsai Tree Hide. L,M,S
10. Log Hide, L,M,S
11. Spider Cave, L,M,S
12. Spider Hide, L,M,S
13. Termite Hide
14. Tortoise Shell, L,M,S
and the list goes on. I will get a product list from them and take photo's of each product as they come out of the molds, so that I may catalog all their products, and to sell them at near cost prices. Really I am not going to pay R190 for a water and food bowl for my roaches when I can get them for R31
Hope this information helped

And remove the substrate

why? The Blatta lateralis is known for carrying their food off to eat. 1 flake of oats will start mold

Let's not relive my mistakes