Liquid Fry Food - You can find this at your LFS (local fish store). Feed a few drops a few times a day to your newborn fry. Be careful not to overfeed and cloud up the water.

Ingredients - Distilled Water, Egg Powder, Autolyzed Yeast Extract, Vitamin A Palmitate, Citric Acid, Sodium Benzoate (as a preservative).

Egg Yolk & Water - Notice the ingredients in the Liquid Fry food? Though it contains yeast and some added vitamins, it's mostly egg and water. I started my latest spawn on hard-boiled egg yolk crumbled in water. Just like the Liquid Fry food, feed just a couple of drops at a time or you'll foul up the water.

I found a link to a recipe for homemade Liquid Fry.

Infusoria / Greenwater - This is just algae (greenwater) and other microscopic critters like rotifers and paramecium (infusoria) . Put some lettuce in a jar of treated water next to a window and in a few days you'll have greenwater. You can try a larger version of this set-up in your backyard with a big bucket of water and some grass clippings and other decaying matter. Let it sit for a few weeks and it'll start to look like green soup. This stuff can stink, so be careful and think of your neighbors. Feed a few drops at a time, too much will also make the water foul and green.

Microworms - Microworms are a very popular food for feeding young betta fry. They're very prolific (you can get subcultures going pretty quickly) and easy to harvest. You just scrape them off the sides of the container with a popsicle stick

I keep my microworms in one of those disposable Gladware containers with the lid placed loosely on top. (I usually leave it on top of the refrigerator). To set up the culture, make up some plain oatmeal per the directions on the container (but a little more runny than you would if you were going to eat it) and pour into the container. Sprinkle some yeast on top of the cooled oatmeal. Then add your microworms.

Subculture as often as needed, like when they start to smell bad... be nice to your roommate. :)

Baby Brine Shrimp - I think I scared my roommate when she saw this contraption sitting on the kitchen counter. (As if the dozens and dozens of fish hadn't phased her...) It's a large pickle jar filled with treated water, aquarium salt, brine shrimp eggs, and an air stone. If it's still a little chilly in your house, you can add an small submersible heater. I just moved the contraption next to a heating vent. (The eggs will hatch sooner, the warmer it is - about 2 or 3 days).

I've stopped using the BBS Hatchery (seen in the photo to the left of the pickle jar), since it wasn't practical for keeping up with the demands of more than one spawn.

A few days ago, I bought a Brine Shrimp Corral . I've heard a lot of great stuff about this thing, so I'm going to give it a try with my next spawn. The way it works is that it sits inside of the aquarium and it hatches and feeds brine shrimp to your fish continuously. The saltwater and eggs the hatchery do not mix with the tank water, yet the newly hatched shrimp can freely swim into the aquarium for your fish to eat.

Sounds a heck of a lot better than filtering them through coffee filters 4 times a day!

Frozen Blood Worms - They look and sound scary, but bloodworms are just a type of insect larvae, and are not really a worm. Your older betta fry will like these, and the frozen adult brine shrimp. You can find them at your LFS in cubes or solid blocks.

Frozen Brine Shrimp - I'm not ambitious enough to try to culture adult brine shrimp. It's easier to just buy the frozen packages at the LFS. I feed frozen bloodworms, frozen brine shrimp, and betta bites to my adult bettas.

Look what I found at the LFS today! Frozen BABY brine shrimp

Mosquito Larvae - The infusoria bucket has now become one giant 'mosquito larvae culture'. The bucket is FULL of them. I take a small bucket of clean treated water with me out to the 'culture bucket' and use a brine shrimp net to scoop out the larvae. I then swirl the larvae in the bucket of clean water. After I have enough larvae in the second bucket, I dump the contents through the brine shrimp net. Then I take the net full of larvae and rinse them with clean water again. Then feed to the fry.

I wouldn't try this with fry less than 6 weeks old because the larvae are a good size and the fry might choke on them. But they sure do love the stuff. They go into a feeding frenzy every time!

Blackworms & Vineagar Eels - These little buggers can be used as food for your fry, but I've never used them myself. I'll add updates on these three once I know more.