Phosphate Advice

[martinmcnally]

Checked my phosphate level today for the first time and its reading 5ppm. I checked my water source RO/DI and its 0ppm.

Would that be an indication of overfeeding or something else? I dont usually give more food than they can eat in around a minute however some of it gets blown around by the fans and is probibly consumed by brissle worms.

Anything else that could be putting phosphate in there? I have some algae growth on the sand bed but I wouldnt call it extreme.

Whats the cure? Water changes?

I am not running any mechanical filtration except today I installed a 100micron filter sack on the overflow pipe to my sump. There is a lot of particles blowing around in the water. Thinking about getting a canister filter but have not yet.

Thanks in advance.
Martin