How big do Swordtails grow? Which would you recommend for a 20 gal, that or Mollies?

[anewbie]

Hi, forgot to reply until now but thanks for the advice! After some consideration I've decided to get platys instead.

Arggg but they lack the pointy tails required of fishes; great for stabbing snails

 

[Naughts]

Do you know your GH of the source water? If you have hard water, the smaller and slower options you are discussing (platy, endler, minnows, shrimp) are good. Not danio, they are very active and need a lot of room. If you have soft water, it will need more thought.