ok I have 9 smalls/meds in a 5 gallon at the moment I know that 2 small and im geting another 20Gal hopfully tomarrow or sunday. the crab i recued/ adopted is in my 10 gal is a Very large/jumbo crab and will be moving in with my other 2 jumbos soon into a 20Gal long. yet i find putting in two water bowls and 2 jumbo crabs with climbing stuff, is very hard to do. So what i ask Would a 29gal long or a 20gal Tall be better for the 3 jumbos????????