Greenish water

[Alicedalotl]

Hi guys, I have a bit of a problem. Every single time I change the water of my axolotls tank, it ends up with a slight green and noticeable tint after just 3-4 days. The tank gets a few hours of indirect natural lighting and parameters are fine. Could it be too much sunlight? It's not super green, the tank is not cloudy, so idk if I should be concerned. Any advice?

 

[wolfen]

provided the green water is under control with water changes your axolotl shouldn't be effected although make sure that the water has good oxygenation to reduce any surface gulping.