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Extra airation of wetted peat or just plain old fry containers was something
I saw at Dan Katz's house this summer. I tried it and
it's caused a substantial improvement in the percentage of fry that become
juveniles. It's now nearly 100% where in the past due to my usual neglect
levels it was less, sometimes substantially less.)
Nothing very complex - an airpump and a slow dribble of air bubbles into the
container holding the fry.
I don't have that much experience with peat spawners but I think
belly sliders are a rare thing (less than 5%, certainly). But, I think adding
extra air is a good thing and have moved all my killi fry to small tanks
with air. I haven't yet tried airating the egg containers, I imagine much
like the proverbial chicken soup 'it can't hurt.' I've read in TFH where
Bob Allen in Utah did this for his Lamprichthys tanganicanus eggs with
good success, but that killi is not necessarily representative of the group
as a whole.
Whoever is getting 80% belly sliders without oxygen pills is probably missing
some other problem. Dunno - wetness of the peat, incubation temps, some
impurity in the tapwater? That's way too many belly sliders imnsho.