I used blue-green chromis to cycle my tank. I still have 2/3 and only lost one because he decided he wanted to inspect my new flooring.
Either way your obligation as a friend is complete once you've provided him with the assistance and advice to get him going. If he decides to ignore what you suggested then it's on him. Why get frustrated?
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I have to go out and buy more snails for my hermit crabs.
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