Are both the pixies and the zulu fry being raised in the same tank?
It’s possible that they could be symptomless carriers of diseases that may be fatal to the other species — Pixies/Zosterae are near the florida coast, while Zulu/Capensis are from a small area in South Africa.
I’d seperate them into 2 seperate nurseries if you haven’t already done so.
Also, have you tried a sponge filter rather than a hang on back filter? There might be too much flow where they can’t snick the bbs easily. I’ve had no problems raising fry in small tanks with just a simple airline tube + sponge filtration and frequent water changes.
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