My tank is quite new still but I'm starting to get traces of hair algae, namely the dark green type on the gravel and some plant leaves.
I've done some tests and my parameters are
125ltr - actually ~90ltr
ph - 7 - is this too high?
PO4 - 0.5ppm
NO3 - 5ppm
The problem is my tapwater is full of phosphates, it maxes out a test kit within seconds, so I was thinking of removing it with either RO or a API filter or some sort. I do a 30% weekly water change you see, but I'm worried that all I'm do is introducing fresh phosphate into the tank. I know you need phosphate but I assume it's better to have a deficiency and does it upto the required level rather than have it in abundance?
Any advice would be appreciated.