hi guys got a strange encounter which i cant really solve , last week since my tank crash , i change sand to a dsb add in old rocks and previous water ,
i then start to cycle my tank once again by throwing in a market prawn ,it normal cycling for the fist 3 days where ammonia shoot up then suddenly which is 6 days later.
I test my water and to my suprise ammonia -0,no2 -0 and no3 -80
what happening ?is this what they call speed up cycling ,or due to my old rock and water my tank is cycled and am i ready to add fish now? tks guys .