Multi-select problem: How does the next paragraph end?

How to care for brackish water fiddler crabs (uca minax )
Provide space.
Fiddlers need room, only two can fit in a 5 gallon (18. 9 l) aquarium and only four can fit in a 10 gallon (37.9 l) aquarium. So make sure you get the proper size aquarium.

Options are:
I. The smaller you use it, the less can you put in your tank. The goal is for the fiddler crabs to have enough room in a tank to roam, but not so much that they escape due to accidents.
II. Tank sizes vary depending on age and how experienced you are at caring for fiddler crabs. Keep the size of your tank in mind and ask guides for the measurements.
III. Provide lots of climbing and hiding spots. Provide the right environment for your fiddler crabs.
IV. Neither bladder size nor large space are recommended when it comes to housing a fiddler crab. Provide a brooder for the crabs.
III.