Hi there
IMO I recon buying the correct food is just playing safe, so you might as well do it if you want healthy fish. Although I have lost the boxes to both my No.1 and No.2 liquifry so I'm not sure of the differences. But they wouldn't make one for each if there wasn't a reason to.
Basically, play safe, use the right stuff. You don't have to use liquifry though, there are plenty of alternatives for livebearer fry...
[this is food for guppy fry, but it's pretty much the same] copied from
here
Baby Brine Shrimp (BBS)
This is generally accepted as the #1 food for guppy fry. If you have a large guppy-breeding operation, you will want to give them the ultimate - live BBS that you have hatched yourself. If however, you are carrying on a small hobby, look for the convenience of frozen BBS. Make sure though, that it is BABY Brine Shrimp, not Adult Brine Shrimp. BBS has much more nutritional value than Adult Brine Shrimp (ABS) and can fit into the fry's tiny mouths. Remember, anything that is too large for fry to eat will go uneaten, wasted, and it will pollute the tank. The bonus in serving up live BBS is that what is not eaten immediately will survive and be consumed later. Be conservative and keep a watchful eye when feeding frozen BBS since it will rot quickly if not eaten right away.
Here is an informative link about Brine Shrimp.
Egg Yolk
Another good fry food that you probably have in your refrigerator right now is egg - specifically the yolk. It can easily be made into a paste that is simple and inexpensive. It is a great source of protein that is eagerly consumed by fry and adults alike. Simply take a hard-boiled egg and remove the yolk. Place it in a small, re-sealable container and add a few drops of water while mashing it with your finger or a spoon. When made into a paste you can feed TINY amounts to your fry. It creates a cloud of protein for them which they will devour. If you feed too much, however, you will foul your guppies' tank. You can feed them yolk twice a day. Adults will enjoy some egg too, but use less water to create chunks for them to eat. Liquid fry foods are also available in tubes similar to toothpaste. Use sparingly, as it can easily pollute the water.
Microworms
Oatmeal Microworms
Microworms can easily be cultured and fed live, an excellent food and a low-cost alternative to BBS, however many breeders like to continue feeding BBS in addition to microworms for variety.
They are thread-like worms imported from Europe which are tiny enough for fry. I use oatmeal or mixed baby cereal as the culture medium which is very nutritious -- healthy worms means healthy fish food! Microworms do not crawl very high on the sides of a container and are easily contained. There are many ways to harvest them, however, as seen above, I lay pieces of rough scrubbing pads on the cereal and swish them in a jar of water with a popsicle stick. The worms, which have crawled onto the popsicle stick and pads, fall to the bottom and any cereal will rise to the top. Just pour this off a couple of times and the worms will be clean.
Fry will grow more quickly initially with microworms and get about a 2 week head-start over fry fed BBS, although they will eventually catch up. However this growth spurt is important and helps in fighting off diseases. Microworms will remain alive much longer in a tank than brine shrimp, and do not swim away from the fry. These tiny worms are also much easier to culture and handle than BBS and after you have a culture going it can last indefinitely. Although this food is best fed to fry, all guppies will benefit. Feed sparingly to adults.
Daphnia
This is popular, easy fish food. Also known as "water fleas", there are magna and pulex varieties. Magna is a bit larger and more suitable for guppies. The best culture is green (algae) water.
Vinegar Eels
These are very tiny nematodes and only suitable for young fry. They can be found in unpasturized cider vinegar, or cultures can be purchased. Simple and easy to "grow": all that is needed for a culture medium is cider vinegar, an apple, and water.
Further information on feeding the larger guppy can be found on "Feeding the Growing Guppy" on this site.
