Why do people continually promote Damsels to cycle a tank?
There is a better way, and it's cheaper, and more reliable, and it doesn't kill a fish. Just use a dead shrimp...
If you don't care about killing fish, please find another hobby.
We can argue all day long about whether aquarium keeping is good or bad for the environment, but you cannot justify harvesting and killing damsels because you are too impatient to look at an empty tank for a month or two.
John