i am gonna set up a convict breeder, is 20l too small for a singla pair. i will be empting the fry out as soon as they are free swimmers. and also, i do water changed like clock work. is it gonna be a problem?

Yep..10g is enough. My pair just bred...and waiting for the fries to be free swimming and going to move them into another 10g or 5g to grow them out a bit.
thank you all for your input. it is greatly needed and appriciated(or how ever the heck you spell that)*L*