swordtail info.

well, swordtails are members of the livebearer family poeceliadae, are native to CA, grow to 4" (not sure), are omnivorous, but mainly algae grazers (I think), and are not schooling or shoaling fish, but may pine away if not kept in groups.
 
go to your local library and take out a book on livebearers.
 
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