Sure was! Good thing I've got a ton of really good rock in the tank, huh? Well, that and a nice big water change.
Yes, there was a spike in the ammonia but that really wasn't the concern to me as I knew the rocks could handle it. It was more the fact that the ammonia and nitrates spiked in a matter of hours AND the HOB filter was putting hydrogen sulphide laden water into the system. Ammonia spikes typically mean somebody dead or dyin'; hydrogen sulphide can be the killer.
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