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That's very good advice. Thank you very much.
I guess it's one of the problem. I already changed the direction of the flow now. Hope it will work out. But the water should get clear even if I...
Not anything yet. Just starting a new tank.
I accidently put sugar-size sand into my new tank without "washing" it, then the water get very cloudy. After one day the water get a little bit...
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