I just changed my sub w/ live sand and got rid of the CC
. It is so much nicer! I don't know if anyone would disagree, but here's how I did mine and got no spikes after and infact my tank has been much more stable with NO2
since the change. Well, I have a 110 gal
and 100 lbs of LR
. I just took out all snails, hermits, livestock, etc.... and as much live rock as I could on one side of the tank. I then took a wet vac (Here's wher some may say I'm crazy) and stuck the hose to the bottom and vacumed as fast as possible all the CC
out w/o letting too much water get vacumed out. The trick to this was sticking to the bottom and shutting off the wet vac before I lifted it into the water. I sucked up maybe only 1/3 water BUT I saved my water from getting cludy from all the sh** on the bottom of the tank. I then poured the live sand into the tank by putting the bag to the bottom and emty it gently so it didn't fly all over. I got my sand $1.00 a pound so it wasn't bad. My water was clear in 2 hours and all went back in the tank. I didn't lose 1 creature! And didn't have but maybe a tiny tiny spike in NO2
over the next week. It worked for me, but some like I said may think I'm nuts. Just my own 2cents. Good luck however you decide to do it! It was worth the days work!