Once a month is fine. Gerbils are desert creatures so produce very little urine and waste compared to other rodents.
Maybe once every week or when the Gerbil and his cage start to smell
clean the cage out and the food.
daily
two boy gerbils should not fight, aslong as they knew each other form since they were pups. if not, use the split cage method and you should be fine. if you leave some old bedding in the cage when you clean it out gerbils are less likely to fight. girl gerbils are more dominent so boys are less likely to fight then girls. always keep a pair of gerbils, or they will get depressed. some gerbils do like to live alone, but this is uncommon.
Every 1-2 months.
I believe they are small and can be different colours such as brown, black, grey and mixed. They are a bit like a cross between a rat and a mouse. They are surprisingly clean animals and you don't have to clean their cage that often.
I clean out my hamsters cage twice a week.
yes or no because if a person had fleas and they picked it up it could get fleas
about once a week works for me and my friends that have tortoises
Gerbils are naturally clean creatures. If a gerbil smells it cage probably needs cleaning. If not it may be ill. If this is so consult a vet.
Barely. After a while, maybe about a month, the smell will start and you should clean the cage. They also don't pee that much because they are desert animals and therefore do not need much water. So it doesn't smell at first but eventually it will stink
it is unhealthy so you should often clean the cage.
you should clean your guinea pigs cage every 2-3 days just to make sure they don't get sick, and it doesn't smell. sak :)