The more water changes you make, the faster they will grow. There are still plenty of things in the water you can't test for, you see. As for sensitivity, the more waterchanges you make, the less effect each one will have on the grand scheme of things, which means things are actually made very stable, which all fish like, especially fry. A bunch of small waterchanges very regularly ( like every day or two ) will work better than a fewer number of big ones, which would indeed create the fluctuations you want to avoid.
Yes, it's normal for most of the fry to live when kept under good conditions. Luckily, swordtails aren't the breeding machines that guppies tend to be.
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