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It is more if you have an open top tank and they have access to light, but they are all house plants and can survive with diffused sunlight, though they won't do as good as a job, if they did have a light shining on them. I plan to put a pothos in one filter so I can keep ammonia and nitrates down. I will also use a smaller filter to house some bacteria and flow. Also, I would have some poly or sponge in the filter to just do mechanical and maybe some biological too.
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