I use a fine syphon tube and kink it with a G clamp to allow a constant slow drip from the infusoria culture into the rearing tank.
Yes, lettuce rots in water. This is the first stage of the culturing of infusoria, a microorganism used frequently to feed fish fry.
When Betta fry first hatch they will get nutrients from their yolk sack until they are 2-3 days old. After this they will become free swimming and need to be fed. At this stage remove the male so he won't eat the fry. Now you will need to feed them infusoria. You will need to culture infusoria at least 2 weeks before you plan for the eggs to hatch. To culture infusoria get a 1litre (1quart) jar and fill it halfway with aged or distilled water.
I found this which may of be use to you :The baby fry feed on small organisms called infusoria and algea. To grow infusoria for feeding just get a jam jar of pond water and run it through some cotton wool or muslin to get out any larger predatorial organsims like daphnia which will eat the infusoria and add hay the water. Leave it for a few days in a dimly lit room at about room temp. and when you next look you should see lots of tiny white dots in the water which, if looked at under a microscope reveal to be lots of types of infusoria in their millions. these can be fed to the fry by adding them to the tank. To get more just add some of the old water containing the infusoria to boiled tapp water with hay and repeat the other proceedours. As the fry grow their diet changes. When they reach about half an inch they can be fed small organisms like daphnia or cyclopses. These can be obtained by dragging a net through water where they can be see or they can be purchased from aquarium dealers. Soon the fish will eat the same food as the adults and will quickly grow.
Not a lot! At least a pinch of food they're small!
Infusoria are microscopic aquatic organisms that can be cultured for use as live food for fish fry. To make infusoria, you can start by filling a container with water and adding a small amount of organic matter like boiled lettuce or hay to create a nutrient-rich environment. Place the container in a warm, lighted area and allow it to sit for a few days until the water becomes cloudy with microorganisms, which can then be used as food for fish fry.
Microworms
Fry are baby fish, and since babies can't have babies, then there is no such thing as baby fry. However, a fish fry is one that has just been born, or one that has just become free swimming (a few hours to days after being hatched). A newly hatched fish is generally referred to as larvae. Not all baby fish are referred to as fry. For example, stingrays and sharks are called pups, eels are elvers, and herrings are sprat.
Brine shrimp.
Kill them you can fry an egg and break the yolk up and feed it to them
Walter Eugene Garrey has written: 'The effects of ions upon the aggregation of flagellated Infusoria ..' -- subject(s): Infusoria, Ions
As soon as the egg sac has gone.
you should probobly feed it Canadian ants. there high in protein