since the egg is now on 8th days, you must have vein on it, if not then something is wrong inside.
if you not see any vein then you should throw it or if you can't see any vein because of too dark eggs, wait 2-3 days and candle again, no vein more? see if eggs were developing, if not then you should tossed them. no need to put useless and undeveloped egg inside bator, they only *eat* space inside that you can put another solid thing like stone to make the bator work better.
if you not see any vein then you should throw it or if you can't see any vein because of too dark eggs, wait 2-3 days and candle again, no vein more? see if eggs were developing, if not then you should tossed them. no need to put useless and undeveloped egg inside bator, they only *eat* space inside that you can put another solid thing like stone to make the bator work better.