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Does anyone know if the petricola eggs / wigglers / fry are light sensitive?

In order to conserve energy, I have been collecting eggs/wigglers and putting them in a floating container in my main tank with a gentle flow of air. This saves adding a tank with a heater to an already too high electric bill. On the day that the wigglers have used up their egg sac I start feeding finely crushed flake food and BBS. I get very few survivors only one or two per batch, and I am wondering if this is because of the direct light over them. I have heard that some synodontis fry are light sensitive and that is why I am asking this. Any ideas?

Thanks,

Bill

How about putting a small cave of some sort in there (a few bits of plastic pipe, say 1" PVC pipe for water-supply)?

I have no idea if they are light-sensitive or not, but supposing that is the case, some shade should sort it out - I suspect if it is true, the fry would be hiding themselves in the shade.

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Mats