hey! my parents 29 gallon bio cube had an ammonia spike over the weekend, found a huge cluster of waste in the filter. anyhoo, handled that problem ad did a 50% water change, we let it sit for about 2 hours and re tested the ammonia and its still off the charts i did full tests on everything else and the numbers all seem ok(waters a bit hard though) but i would think after a 50% change the ammonia should have gone down at least a bit right?