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I am doing a project on making an ecosystem in a 2-litre pop bottle for my 'bonus project' for grade 10 science. I was wondering if you feed the fish or just leave them? (link)
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as the other person said, there should be some kind of plant that you put in so the fish can eat that. but after a while, the fish will eat all of the plant, so you'll eventually have to feed them fish food. when i did this, i just took the fish out when i took it home, because it tends to smell bad after a while. so i just put the fish in a fish bowl with the plants and rocks, and fed them fish food.
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