(Are They Kept in Groups?)
How many isopods should you put in a terrarium? You should have around 10-15 isopods per 25 square inches.
Let’s say that you have a 5-liter terrarium. There should be 10-20 isopods in the tank. You can add a little bit more, but make sure that they are not too many
Food Depletes Quickly
Your isopod food should spend around 3 days in the tank. If the food is already decomposing, it should be gone within 24 hours.
Presence of Mold
The presence of mold in your isopod terrarium indicates that there are not enough isopods. When you have many isopods in a terrarium, they will consume their food before it becomes moldy.
As you already know, the size of your isopod tank matters a lot as you need to add more isopods into larger tanks. Do not forget about the tank ventilation as well.