1. Use glass finger bowls filled two-thirds full with system water.

2. To each bowl, add 8-9 grains of boiled wheat, 1/5 of one 7.5 grain brewer's yeast tablet, and 8 ml from a paramecia seed culture.

3. Stack the finger bowls 6 or 8 high, cover, and store at 28.5ºC on well-lit shelves.

4. After 14 days, the paramecia are ready to feed to the fish larvae. Cultures remain useable and healthy for 3 weeks or more.