The float test in my opinion is not reliable. It is useless before the eggs are fully developed. If the eggs float AND wiggle independently then they are still viable. However if they don't wiggle or sink they aren't necessarily dead. Chances are high they are non viable, but people have opened these thinking they were gone to find still live chicks. I would never float test until after the hatch date has gone and only after candling to make sure there are no pips or cracks.
