I recently bought one of those brine shrimp hatchery kits that uses a 2 liter soda bottle and an air pump. The directions say to add 1 liter of fresh water and to maintain a temp of 80 degrees. It also says to provide them with light and to turn on the air pump. I followed the directions, using a small 50 watt heater to hold the temp, and put them about 2 feet below a PC bulb, but the eggs don't hatch after 48 hours. I've tried twice...once with the air pump running at almost full bore and then once with it barely oxygenating the water. The eggs are San Francisco Bay brand and I don't see an expiration date on them. Has anyone ever used one of these kits? Is it possible that the eggs are bad, or am I doing something wrong? I've only got one more packet of eggs left and I don't want to waste them.