I will freely and shamefully admit that I slacked off and let my tank go. I'd like to whip it back into shape, and the answer to a few of my problems is obviously water changes. Which do you think would be most beneficial? Several small changes a week for a several weeks, or 2-3 larger changes a week to really get that old water swapped out? The tank is 120g with a 40b sump. I have a pipe thingy that I use to siphon water out and I can either siphon out 20g or 10g at a time. I haven't done any testing yet, but I can look around at the cyano, the pathetic unhappy SPS, and the proliferation of pests (probably because I overfeed to keep an aggression issue under control) to know that my water is diiiiiiiirrrrrrty. I don't want to shock the tank by too much turnover, but I don't want to wait until Christmas for the cyano to go away either. What would you do?