I kept a single con in a 10g grow out tank to keep the cycle alive. He grew fast and I think he hated me for keeping him in such a small tank. He never came out of hiding and when ever I came around the tank he'd give me the evil eye and hide.
I felt sorry for him and dropped in a female for company. They spawned had babys, and as soon as the babys became free swimmers he slaughtered her.
I was so angry with the fact that he hated that tank I stopped using it all together.
He now sits in a 29g with a new female pink convict and Has had more babys then you could shake a stick at in a days time. 10g with a con....... maybe for a month or two while young and small, but I personally wouldn't do it again.