in general males stay a lot smaller than females so if you have no intention of breeding then get 2 males
teacup makes most people think they will stay small but infact teacup ray is a term given to lots of unidentifyed rays mainly they are reticulatus which still grow fairly big 14-16inch disk but with a very long tail
the smallest FW stingray is scobina with females maxing out at about 12inch dick and males about the size of 2 fag boxes but they are very hard to find i had a pair once but they are the only ones i have seen in the UK
if you want the smallest then go for hystrix marble moptoro or reticulatus males
good luck stingrays are worth all the effort if you get it right
Do I need more than one? are they social animals?
they do better with more than one
2 males are fine if you dont have any females in the tank or they will fight
if you want to breed its best to have 2 females 1 male as it spreads aggression
male can do bad damage to female when they are trying for the firset time
the male was fast growing once he was eating properly but slowed down and last i had them, was just over half the size of the same aged female. As the rays turn, their tails catch on the glass and end up getting very sore.
I assume my male was probably close to fully grown, he had stopped growing and was just bulking out. They did look hilarious together and the female often sat on him and I would panic wondering where he had gone and then looking back again he'd be sitting on her. I could watch them for hours!
