Good luck. I was trying to catch an angel fish in my tank. I left my net in the water for a couple days to let everything get used to it, thinking it would work. Well needless to say I had to take all but 4 rocks out of my tank to catch his little......nevermind. Since tearing into my tank, my nitrate levels have increased which I am getting under control with some water changes. My advice, if and I say IF you have to tear your rocks out, get a gravel filter and hit your sand bed real quick. If you can look under your tank the areas you need to watch out for will be black in color, if you stir this up it is the same as throwing a bomb in your tank. So clean those areas. Through this process my nitrates were off the chart, I vacuumed the sand I could get to and now things are lookin good. No deaths in the tank through this process. Good Luck!
Fuzz