How do you keep your acrylic tanks algae free without scratching them?
I have used a magnet in the past but this scratches my acrylic.
Is there a solution you guys use to kill the plant matter in the water?



I have used a magnet in the past but this scratches my acrylic.
Is there a solution you guys use to kill the plant matter in the water?



. my friends have had enough, they told me so.
$$$ they will not budge.