Bizzare Ammonia Spike? - Tropical Fish Centre You're clearly going through a mini cycle which means either your filter can't cope with the bio load (have you tested this tank recently before this? www.tropicalfish.site5.com/tfc/showthread.php?t=59827 Bizzare Ammonia Spike? [Archive] - Tropical Fish C You're clearly going through a mini cycle which means either your filter can't cope with the bio load (have you tested this tank recently before this? www.tropicalfish.site5.com/tfc/archive/index.php/t-5982