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Sorry, but this is just wrong. You cannot replace the natural live prey of these fish with occasional feedings. They hunt constantly. Some may adapt to prepared foods, but many many more will starve in that situation. Not because the people who buy the fish were dumb or lazy or didn't do their research or didn't try hard enough. We can't really count on totally replacing their natural food supply with prepared foods. The best we can hope for is to supplement their natural diets. The OP may find that rare mandarin or scooter blenny that will do well, but the odds are not good.Even on prepared foods you need to put some effort into variety. It would seem those who bought their weaned mandarins did not put effort into variety, nor did they do their research. But the point is, if you do it right, prepared foods are a much better option than relying on the productivity of tiny, live crustaceans in a large tank.
In a large enough refugium, maybe. Pouring pods from a bottle, not so much. You just can't replace them faster than the fish can eat them. I know you can set up separate systems to culture them, but I don't think that's what you're talking about, and I doubt that's what the OP has in mind.Not only that, but culturing copepods has come a long way. It is possible to culture enough pods to feed a mandarin every day.
That's interesting logic.If anything, a smaller tank would provide a higher density, thus you could use less copepods, with minimal waste..
Look, I don't mean to be a scold, and people can do what they want. However, I just don't think we do anyone any favors by sugar coating the odds and advising them to do something that will probably not work out. Watching an animal in your care starve to death despite your best efforts is a terrible thing. There are just so many better choices for a nano tank.