Figure. 17 day post hatch Pacific blue tang larva. Credit: Kevin Barden. The newly revamped larval rearing room has been up and running since early May. In truth, there are still a few things we’d like to add to the filtration system, but that hasn’t stopped us from stocking eggs into the system as we get them. One of the first larval rearing attempts was performed with Pacific Blue tangs. We got roughly 4000 eggs; which we then stocked into a 210 liter tank (55 gallons).