I am wondering what PH you keep your tank at? The other day I accidentally drained the tank farther than I meant to during a water change (3" of water in tank) and as a result my PH ended up at 7.5 when it is normally 7.1 after a water change. Unfortunately I lost one of my elephant nose I'm not sure what happened to it. However I noticed my bichirs were a lot more active afterwards. Any Ideas?