If you look after the tank properly it should only need a major "cleaning out" once a year or so. To do this, you need to follow the basic rules of fishkeeping which are. :- 1 inch of fish needs at least 1 gallon of water. Every tank must have a permanently running 'cycled' filter. :- Every tank must have at least 50% of its water replaced every week.
Quite often, as a 5 gallon tank will only suffice for the first few months of a hatchling turtle's life.
I have a 75-gallon tank and clean out about 10 gallons every week. Since yours is an 18 gallon tank, I would start with cleaning it every two weeks by siphoning the substrate and removing and replacing 7 gallons. If your water looks dirty try changing 5 gallons every week. But I think you will be good with the two week option.
you can put a betta in a 5 gallon tank
Some suitable bottom feeders for a 5-gallon tank include dwarf shrimp, snails, and small species of catfish like Corydoras. These fish help clean up leftover food and debris from the tank bottom.
you can put a betta in a 54 gallon tank
You can fit a 5 gallon fish tank on a school going desk.
Some suitable bottom feeder fish options for a 5-gallon tank include dwarf shrimp, snails, and small catfish species like pygmy corydoras or otocinclus catfish. These fish can help keep the tank clean by eating algae and leftover food from the bottom of the tank.
A 5 gallon fish tank would have to be completely cleaned out at least 3 to 4 times a week as it's really too small to have any fish; it would be great for a few ghost shrimp, or just some live plants instead
Yes,the Oto will clean the puffer's leftovers(puffers are messy eaters)
5 Gallons
NO
no