What do you have running it? I picture there is an air stone about 4-5 inches above? I've seen some tumblers that lift the eggs off the bottom a little bit every once in a while causing them to roll a bit. You just want to make sure you are getting fresh oxygenated water in there and up past the eggs. I suppose as long as you keep an eye out for any white fungus, they should be ok. If you see any rot or fungus on an egg, remove that egg completely.
Got it going a little better I hope my little chimate norths make it I have 6 babies Proley about 1cm in another tank but they Proley got eaten by now I had no where else to put them unfortunately oh well I got 10 now if these make it
That looks like the one I had many years ago but the kind I have now is different never used one that. Was as wide as this before. Mine doesn't move that much I think I need a better air pump I got a cheap 15 dollar one