Let’s face it very few of us (if any) enjoy doing water changes in our tanks, especially once you get into a larger tank. Many months ago I started researching ways to at least partially automate this chore. My original thought was to mimic some of the systems I’ve seen that
employ a container of some sort that can be taken off line, drained, refilled with new salt water, then placed back on line. This essentially allows a good sized water change to be accomplished by just turning a few valves. While this is, in of itself, a great system I was intrigued by what is referred to as a “continuous water change system”. Some of these systems are quite complicated with peristaltic pumps that continually add and remove small amounts of water. In my case I went for something a bit more simple. I drilled a hole in the top end of my 55 gallon sump and installed an overflow. I then plumbed a pump from the basement to the display tank. I have a 30 gallon trash can with a power-head and heater that I mix and hold new saltwater in. Every day at 11AM the pump kicks on for 2 minutes and pumps approx. 3 gallons of fresh saltwater up to the display. That, in turn, displaces the same amount of water in the sump and causes it to overflow. Presto! Two minute water change and I didn’t even have to be home. I still have to do some vacuuming/siphoning and other water removing maintenance but even that has been simplified, as I can siphon out what I need to and then just manually activate the pump to refill.
So why do I like this method over the typical weekly, bi-weekly or even monthly large water changes. In a word “stability”. I find it keeps things very stable, adds trace minerals daily and overall keeps my livestock looking healthier. I actually did a test for a while where I manually hauled a bucket upstairs each day and did a 2 gallon water change. During this time I noticed that my corals looked better and polyp extension was noticeably increased. With the new system up and running for a couple of weeks now, polyp extension is phenomenal. There are of course down sides. Nutrient reduction is not as effective this way as each days small water change is diluted before the next one happens. There are some graphs and figures out there (reef central even has an interactive calculator for water changes) that show to what extent, but I have a big skimmer and I’m careful to limit nutrient input as much as possible, so the slight decrease in nutrient export doesn’t worry me.
There are lots of ways to run a successful reef tank and this may not be for some folks, but I’m very happy with what it’s done for my tank and the automation has left me more time to enjoy the hobby.
Happy Reefing!
