Tetra AlguMin

[Cliptys]

Hi im new ro fish tanks and im currently treating with tetra algumin to try save my plants but ive done the correct dose. But when i do a water change should i add more tetra algu min or should i just leave it? The instructions say nothing about it and just say a dose for 2 weeks while the problem is is that my water change day is tommrow and i put the algumin in yesterday