You have some serious nitrate, and when you kicked up the debris I'll bet your nitrate levels rose as the debris got into the water column.
You need to do very small water changes every day or every other day, like 10-20%, to slowly lower your nitrate down to 40ppm or under. This high level indicates more gravel vac's are in order for the future, because too much debris is building up. If you gravel vac weekly with a PWC
you should not have this nitrate spike again, assuming you are not overfeeding.
You have a seriously stocked tank here so your regimen is going to be more intensive than for the average community tank. I'd wager your filters will need frequent attention, also, as they can be nitrate factories with a bioload like you have. Consider rinsing the media and replacing floss weekly in the Fluval, and rinsing the foam inserts weekly in your AC
. (don't kill me! 8O)