It is a plasmodium of slime mold, which has become a hot topic recently. I have not confirmed the fruiting body, so the type is unknown, but I feel that it is a moji dust or a susu dust.
 This child seems to like whitish mold, and seems to like the type of mold that occurs in beetle and stag beetle breeding cases. Although they don't like it very much, they can also be bred with commercially available edible mushrooms such as mushrooms and aspergillus.
 The appearance that changes shape every day is so lovely that it is one of my favorite eukaryotes.
 The flooring used is kitchen paper or tissue paper that has been moistened to the extent that it does not become fluffy, but additive-free ones are preferable. I don't think heavy metals and chlorine in tap water have any particular effect.
 It's a good idea to change the flooring regularly, as these children will get rid of excrement-like stains after crawling. When replacing, I think that it will work if you cut out the slime mold together with the old flooring material and put it on the new flooring material that you replaced.
 Basically, I like dark places, so it's a good idea to keep it quietly in a drawer of a desk or in a gap between shelves.
 If the environment deteriorates, it will become sclerotia or fruiting bodies, so please maintain an environment that is damp and dark and has a temperature of about 15 to 25 degrees Celsius.
 Currently, only one of the second images is in stock, but I think it will increase soon.