Good way to Culture Infusoria

Hi all,

Just wondering if anyone out there had a good method of creating a infusoria
culture.

Reason being I am thinking of spawning my beautiful male betta

The room temp around my area now is like 20 C . any advice would be good.

All i know is that i should use some old aquarium water and put it in a
clear cup, add lettuce and leave in sunlight. Tried that but didn;t notice
the film forming.

I just want to make a successful culture so i can prepare to fed the fry
when I do spawn.

Thanks in advance.

Slats