I used this 32 gallon roughneck as my hatch & grow-out tank. It works well with a dim light hanging over the middle so that any food is lit up. At the bottom is an air pump operated sponge filter to circulate the water.
First I grew algae using a bright light. Once the eggs are a few days from hatchingI introduce a culture of Rotifers to the container. Before long the water stops getting greener and begins to pale. About this time the eggs get the silvery look of being ready to hatch. I place the eggs right at the top so they are barely submerged using fishing line to hold up the rock and have water flowing over them. This maximizes the gas exchange.
When they hatch I swap the bright light for the dim light. The larvae are now in a container filled with nutritious algae and massive numbers of rotifers.
In the picture you can see the fry have already gone through metamorphasis. It doesn't look like a lot of fish until you start trying to count them.
