Seed floating in the water good or bad quality ?

It doesent matter weather it sinks or floats the only reason it would sink would be if there is a way for the water to get into the seed hence weighing it down making it sink. I use this method of germination but you only want to use this much water when you are trying to get her to "pop" then as soon as she has you can pop her on a more appriopriate medium like kitchen roll or cotton wool with alot less water. Any kind of seed will float for the fist time in water unless there is a crack in it somewhere after around 12 hours you will find a slight tap ontop of the seed will force it under and this is because in that the time the water has moisted the husk to allow it to absorb some water hence sinking. Germination is probably the most tricky part of growing and the most important as the plants are so fragile at this stage its very easy to give her too much or too little. too much water she will drown not enough she will dry out. anyway I'm sure you know all this best of luck :)