Hi Phillip, I would not add a charcoal filter to this setup, It will only remove the Nutrients that you are adding for the plants. The best way to keep water from going stagnant is to keep it moving. If you want to go for max assurance that it won’t, add an air stone in [...]

That depends on what you are allergic to. If you plant something you are allergic to, then you will have problems. But if you stay away from the things you are allergic to, then you should have no problems. That is to say if your only allergy is to cats, then plants would not be [...]