Commodore1

I still have all 20 babies and all red in colour except for about four who are still see through. Will they stay like this or are they just slow develpers?

Chief_waterchanger

Is it all the same strain of swordtails? Do you know whether the female was in a tank with any other types of swordtails at the store? If so the female will throw mixed lots for about 6 months. Color-wise it is doubtful they are "slow developers". Slow developing happens most commonly with size, generally the ones born without color will be helleri green. (Helleri: the species that most domesticated swordtails are a hybrid of.)

swords3711

swords grow extremely slow
i have one black sword that is about four months old and only about a half an inch

Commodore1

I'm not sure if she was with any other coloured swordtails. I hope they are green cause that would be awesome. If they grow really slowly i guess they'll be in that tank for a while