The basis for many live larval feeds is green water. Most folks are only interested in killing it. I need to farm it. Many fry need micro-food for the first few days of life and unless you are prepared to grow it yourself, there is little chance you have any chance of raising many species of fry.
Here is my latest, the Bio-Green 1000!
Notice the highly sophisticated Spackle bucket, hanging illumination source, and complicated water circulating system!
Yep, that is all there is to it. I use a daylight compact Fl bulb equiv of 100 watt incandescent on 24/7, a 5 gallon bucket and an in-tank Tetra whisper filter with the filter removed. Every day I remove 1/2 gallon of green water for my daphnia, and replace it with water from the tilapia tanks. That is it. I originally got a start of green water from a tank that decided to turn green on me, but I have also gotten starts from the LFS turtle tanks. That is all there is to it.