Haven't raised any in a while, but when I did, I simply used a small pop bottle with the bottom cut off. I suspended this upside down right in my display & hooked an air pump to it. Attached to the rim with a clamp, bottle cap had a plastic air line elbow through it for the air. Used a turkey baster to fill it with tank water. When the BS hatched, the cysts would sink to the bottom into the rim of the cap. Once hatched, all I did was use a baster & sucked up the critters to feed to the tank. Pull the bottle, dump it, rinse, repeat as desired.
Using this method, I didn't have to mix up any water or use a heater. Downside is, the bottle can be a bit unsightly hanging inside the display. If you have a sump, your one step ahead.
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