So I’m starting a betta planted tank for the class pet in yearbook. And I want to use sand to cover the plant substrate. I took some old quartz sand out of my old saltwater tank and rinsed it really good with tap water then drained the water and filled it with H202. After a few more rinses will this be okay to slap in the betta planted aquarium? Or is there any other steps I should take? A few sand grains are covered in green algae which I’ve tried to remove most of them because they subtle on top of the rest of the sand but will that die off in freshwater or from the H202?
