Thanks, I'm presuming my tap water will be naturally low in nitrates due to the low level or could that be the good bacteria keeping that low?
I'll test some tap water tonight to confirm.
Also this will be a silly question however as a beginner I can be forgiven haha
My tap water is really cold and obviously doing a 50% water change tonight will drastically change my temperature in the tank. I am thinking of adding a boiled kettle to every second bucket of water to combat this unless there are any other suggestions?