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I thought about this a lot over last summer. I decided to take pretty much every filter off my 75G plant tank. The only filters I have are basically a sponge over my overflow to prevent fish from going down into the sump, and a drip of water per second, flowing over bio balls. This is just in case.

So I guess yes you can run filterless, just ensure you have healthy plants, cause if they stop growing, they won't be removing anything, and if they start dieing, they will be contributing to the bioload of the tank.
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