I used this on an existing tank which I replaced with real plants. So far, so good. You won't flush it out, but it will be a mess for the first few days, don't worry. After putting this in, I took out my filters a few times to continue rinsing them, all in all it took about 48 hours for my water to be crystal clear again. The plants I have seem to be doing well, you might find them difficult to plant because they are so easy, but they are worth it.
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