10/21/09
Solving SPS Brown-out (SPS Newbie Revelation)
***Reader beware: longer post than you probably want to sit through, but I thought I'd share my experience anyways to those who are searching for the same solution I came upon***
I initially got into SPS's for the variety of colors: purples on greens, greens on purples, reds on oranges, greens on blues, well, you get the point - a seamless, endless variety of color combinations. For the longest time, I'd purchase a vibrant, color-saturated coral, and within a week, it would slowly turn brown until all its former glory was gone. A select handful of my pieces would retain it's color, but I always seemed to have trouble maintaining purples, reds, and blues. Eventually, I started shying away from these color types. But after seeing various members pics of what my coral would supposedly look like (not to mention how neurotic I am), I got frustrated and started searching far and wide across the internet for a solution.
Initially, I attributed the brown-out to my underpowered 150w HQI. It seemed like a common factor that other reefers had that I didn't - higher powered lighting that is. I responded by adding supplemental power compacts, trying different bulbs, and different K ratings, but nothing worked. Then, after reading some Advanced Aquarist and Reef Alchemist articles, it seemed phosphate was the more likely suspect: Brown = a lot of zooxanthellae -->> thrive in phosphate rich environments.
Although I've had softie/LPS saltwater tanks running since the late 90's, phosphate was never made obvious to me as a potential issue. The main concerns during my reef upbringing were the nitrogen compounds: NH4, NO2, and the ever so elusive NO3. Willing to try anything, I purchased a Phosban reactor and GFO. Waiting...waiting...waiting...a few weeks pass...hmm, still no coloring up and still brown. Never a big fan of water testing ('specially for phosphates), I left it at that. However, there was one more phosphate source I was overlooking. Luckily, while browsing through some unread, new posts, I stumbled upon a phosphate thread, which mentioned the use of RO/DI water over any other types of water, including natural seawater.
Ever since I started my SPS tank back in Aug '08, natural seawater was my one and only source of saltwater. It was cheap, convenient, and most of all, Pet Club down the street carried it. I was told that the water came from Half Moon Bay, which I always thought had great, suitable quality since the beaches looked a whole lot prettier than the SF Ocean Beach. But, looks can be deceiving. It never occurred to me until I visited the Pumpkin Festival over there and noticed, "Hey, there are a lot of farms in this area, with potentially a lot of nutrient run-off." And that's when I decided to switch over to RO/DI water.
I did a little shopping before hand to look for an in-house system. However, after reading how much waste water would be generated, I couldn't justify to myself the amount of water I would literally be throwing down the drain. Plus, it's not like I can use it to water my lawn since I live in South City, where we get enough water over here from the year round fog to water all my out-of-saltwater-plants. Anyways, I digress. Sooooo, luckily, Aquatic Central carries RO/DI. After around a month of RO/DI-saltwater changes, I noticed a little bit of purple popping up in my rainbow monti and purple plasma. At first, I thought it might have been a fluke, but after further water changes with the RO/DI water, all the coral colors looked exactly how they do in most of your threads.
So, here I stand now, a firm believer in RO/DI water. As obvious as it is now to not do a water change without it, it was my previous oversight that prevented me from fully appreciating my sps corals. Hope this helps someone since it took me over a year to figure this out.
Happy Reefing!