I want to move my red cherry shrimp and snails into a 5-gallon tank (probably the 5.5 from Petsmart). My question is, is a 5 gallon tank large enough to also accommodate celestial pearl danios or endler guppies along with my RCS? Also, if it is, do either CPDs or endlers need a heater? The shrimp/snail tank currently does not have a heater and it stays in the mid to high 70s. Thank you for any help!