I know a few that have as many or more tanks than I do but I would like to share how much of an endeavor doing water changes are each weekend. I have a 180 gallon tank, 80 gallon tank, a 29 gallon tank, and a 20 gallon tank all housing fish. Those tanks are all in my room as well. Even with the ease of using a python it has to take me around 1 hour or so to finish them all. Today was a strange water change in the 180 because my reds were acting very skiddish when I was emptying the tank...the worst I've had so far...they're fine now but was a little freaked a couple times when they swam to the top of the water and thrashed making a rather large splash. After I got to the level I was going to add new water at I moved around the decorations and added some more to hopefully make them a little more active. When adding new water I use the control nosil often and when I turned it to the off setting the damn plastic threading on the fossit slipped and sent the hose splashing to the floor drenching the bathroom...anyone else have this problem? My solution was to buy the brass adapter and so far its doing much better. My water changes consume quite a bit of time but in the end I know its worth it because I have 4 tanks full of happy piranhas and 1 arowana.