I have tested the tap water and the nitrates are really high, i think the ammonia spiked because i changed like 70 to 80 percent water and caused a mini cycle. I added 2 water fall type filters with bio wheels to kick up the bio capacity. The tank has never spiked like this before when i do normal water changes of 20 to 30 percent. I have this 125 gallon tank and an 80,75, two 55,a 40 and an 18 gallon bio cube. All of my tanks are running and i have no water problems anywhere else and this morning everything is back to normal in the gar tank as far as ammonia its back to 0.Agreed, you must get to the root of the water issue. You should contact your water supplier and get a current analysis before attempting to medacate. Definatly test your tape water to get a base line. If your ammonia is spiking after a water change you should increase your bio-capacity too.
so i think it was a mini cycle.
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