Mumma.of.two
Aquarium Advice Obsessed
Convict2161 said:What causes such a spike? I just did a 50% last weekend.
Overstocked tank (lots of fish), leads to more ammonia, which causes more bacteria to grow to consume it, leaving more nitrates. If you haven't done a PWC in 6-7 (?) days then that's why it's so high IMO.