A razor blade will work well for harvesting eggs. But I suggest having a turkey baster at hand...to siphon up any eggs that don't stick to the blade. Using both in combination will help you save more eggs!
Even better, get a seperate tank for the breeders. A good colony of Paleatus can produce 150-200 eggs during each spawn. I personally find that to be too many eggs to harvest. So I pull the breeders, and move them to another tank. The hatchery tank becomes the grow out tank once the eggs hatch, and you get all the eggs instead of a percentage of them. Depending on the size of your colony, a 10 gallon should work well, up to about 7 breeders. Any more, and I'd use a 20 gallon. The 10 is ideal for hatching and grow-out!
Good luck
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