New to breeding. Need some advice

[zero&stich]

Hello all,

I'm very new to breeding and I am gonna try and breed my pair for fun. They been seperated since July.

Female is 1603g-3 yrs approx
Male is 1546-4 yrs approx

My question is yes, I been using aquariums, but I have a 20L and a 55g. Should I treat the 20L as a rack and place the male in with the female? Or place the female in the 55g? The male is 46 inches. The female is 47 inches.

I just not entirely sure if they'll be...well squished in a 20L, lol. I need some helpful advice and some reinsurence.

I appogise for my spelling errors.
Jessica AKA Jess
Thank you.