minnnt
Fish Expert
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Otocinclus would also work... As would Pitbull Plecs.
I think it is just malnutrition unless they have internal parasites, but that you can easily see when they poop (good poop is dark).
Regarding the eggs: why don't you put the eggs in a breeder close to the outlet of your filter? This gives you an opportunity to clean your tank and the eggs can survive at the same time.