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298 Posts
actually, I have a proposal.
Use UV quartz lamps over the tank.
The UV won't penetrate very far into the water (tap water has say, 10% attenuation of UV/cm, so 10 cm below the water you have 35% remaining UV. If you add some blackwater extract or have yellowing water then the attenuation is much higher.
The UV will however fry any plants floating on the surface. Obviously do not stay in the room while you fry them, or cover the top of the tank with a blanket or other shield.
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