What's the main principle of preventing Algae growth?

[Shadow]

no not really, first if you want non CO2, you need to lower your light. Other thing is moss tent to collect dirt/fish shit, thus you need to clean it weekly.

[blue33]

no not really, first if you want non CO2, you need to lower your light. Other thing is moss tent to collect dirt/fish shit, thus you need to clean it weekly.

Give them good current and flow, debris and waste will be wash away.

[Shadow]

That is true, water flow is also important.