Hi, I have a 660 lt outdoor aquarium with four sliders and have an issue with Nitrates and algae build up. I have installed a Fluval FX6 which is doing a very good job and also a uv filter. The water us clear but with a tint of green and the nitrate ldvels ate quite high. As stated the aquarium is outside and gets alot of sunlight.
Any ideas please.
Stefan