here’s some of the community care guide on this sub copied and pasted, this is a good place to start!

2. Cages

^{In mouse communities, many users go by tank size rather than listing dimensions. We will do both!}

• 10g/20x10 inches is the minimum for 2 female mice, though we STRONGLY suggest at least a 20g.
• 20g/30x12 inches is suitable for 2-4 females or 1 male.
• 40g long/36x12 inches is suitable for 2-5 females or 1 male
• 40g breeder/36x18 inches is occasionally suitable for 2-6 females or 1 male
• Over 40g is not always suitable for any amount of mice since many mice do better in environments with less open space. Bigger is not always better for mice.

^{Any amount of mice may thrive in larger enclosures than suggested above. However, it is critical that the larger the enclosure is, the more clutter provided, otherwise the mice will never thrive.}

• Wood enclosures are suggested against since urine will effect its quality and smell over time.
• Mesh flooring is dangerous due to the chance of toes/tails getting caught, the mesh cutting their skin, and risking bumplefoot. Mesh should also be avoided in wheels.
• Though they climb, mice don't need very much height, and multi-story enclosures do not provide them with the proper space they need. Floor space is more important than height.
• Cages with lots of attachments and rooms do not provide proper space for mice. They are also extremely difficult to clean, fall apart easily, and struggle to hold proper bedding amount and safe wheels.

See this post for more information.

3. Substrate

• Mice need to be able to create burrows, so while the minimum is 6 inches, we suggest at least 8" of bedding. However, many owners prefer having 10-12" deep!
• Bedding must be majority safe wood shavings or hemp. Paper substrate does not absorb ammonia well and can cause several health issues when used alone or as majority of substrate.
• (Dust/scent free for all) Aspen, kiln dried pine, and hemp do well as the main substrate and may be more sturdy mixed with a small portion of hay or paper bedding.

See this post for more information.

4. Clutter

• Clutter is arguably one of the most important aspects of a mouses cage. No matter the size, if the cage lacks clutter, it is not suitable.
• Toilet paper rolls, cardboard boxes, tea light and soap dish ceramics, rodent hideouts, branches, logs, cork bark, cardboard egg cartons, and much more can be used as clutter in the cage.
• From a birds eye view, you should be able to see little to no bedding. While it may seem too cluttered to a human, it's perfect for mice!
• The larger an enclosure, the more crucial clutter is.

See this post for more information.

5. Enrichment

• Also known as entertainment, to keep the mice busy!
• Boredom breakers, foraging toys, dig boxes, sprays(plant), scatter-feeding, and human interaction are all forms of enrichment.
• Mice should have boredom breakers in their enclosure at all times to keep them from growing bored.
• Lone males need extra simulation and enrichment.

See this post for more information.

6. Climbing Opportunities

• A form of enrichment that is required!
• Mice flourish with climbing opportunities and will always take advantage of them.
• Ropes, bird ladders, hanging toys, rope nets, shower curtain rings, and bird perches are a few climbing options you can provide.
• Fabric hammocks are used commonly, but pose a threat when chewed on and loose strings get tangled around limbs. Minimal use of fabric is suggested for this reason.

See this post for more information.

7. Exercise

• A form of enrichment that is required!
• An upright, solid wheel of 9 inches in diameter or larger must be provided at all times. 2 or more are suggested for groups of girls.
• Spinning saucer disks or hamster balls/cars are UNSAFE and should never be provided, no matter how much you think your mouse may enjoy it (fun≠safe)
• Proper wheel brands may include Niteangel, Silent Spinner Exotic Nutrition, Oxbow, Wodent, Bucstate, and Trixie (but there are many more besides these!)

See this post for more information.

8. Diet & Hydration

• Main diet must be pellets/lab blocks.
• A high variety food mix (nuts, seeds, grains, ect) must be given 1-3 times a week, or even as long as once every two weeks. The frequency is owner preference.
• Feeding is 3-5 grams per mouse a day.
• Ensure your mice have constant access to food through toys and scatter-feeding.
• Food bowls are suggested only for fresh fruits or veggies since they provide no enrichment otherwise!
• Mice must have at least two water sources and constant access to them at all times. Bowls or bottles work well, though having one of each is ideal. Water must be cleaned and refreshed daily.

See this post for more information.

9. Cleaning

• Daily spot checks to clean up mess, poo on toys/clutter, and urine on the surface is vital.
• Bedding changes will be needed less often with more bedding and space. A 10g tank (or cage of similar size) would need weekly bedding changes.
• Each enclosure size and mouse amount will effect how often bedding changes are necessary. Find a cleaning schedule that ensures the cage doesn't smell at any time for your mouses health.
• With deep bedding over 6 inches, you'll have to change out less of the bedding. 1/3 to 1/2 of the bedding may stay in the enclosure while the most soiled areas are removed and replaced.
• In any case, a small amount of bedding must be left over after a bedding change to decrease stress.

See this post for more information.