In my opinion, the pH range from 7.8 to 8.5 is an acceptable one for reef aquaria. In this case, the pure water’s effect is almost negligible, regardless of its measured pH value. I suggest that the effect of low pH on calcification by corals in reef aquaria is somewhat unclear, but there’s more evidence that it would be a concern in reef aquaria than that it is not, assuming that growth rate is a primary goal. More often than not, the pH is not improved for more than a day, and the alkalinity rises above desired limits. My recommendations on how to deal with high pH problems are detailed below. The acceptable pH range for reef aquaria is an opinion, rather than a clearly defined fact, and certainly varies based on who is providing the opinion. You should always keep in mind that the value of pH is not constant which changes overtime. Many fine reef aquaria vary by more than a factor of two in H+ concentration during the course of 24 hours, and the range from the reef tank with the lowest to that with the highest hydrogen ion concentration is more than a factor of four. Photosynthesis is the process whereby organisms convert carbon dioxide and water into carbohydrate and oxygen. The diurnal pH swing alone is not typically strong enough to drive reef aquaria’s pH to excessive levels (i.e., > 8.5). You are adding freshwater to your reef to make up for the water that has … These recommended ranges are detailed in subsequent sections. For example, you should test your tank water once a week to make sure that the parameters are all in line. For many of these aquarists, they are right: the pH conditions in their aquarium are obviously conducive to maintaining a healthy aquarium. Hopefully, this article has provided the information necessary for aquarists to control pH in their aquaria in appropriate and effective ways that avoid these undesirable consequences. Maintaining your magnesium between 1200 and 1300ppm will help to keep a balanced alkalinity and calcium stabilized which will help your pH to stabilize within the normal range as well. However, I do not consider pH measurement a wasted effort, particularly in cases where very high or low pH additives are being used because not everyone’s pH will naturally fall into an acceptable range. While your daily maintenance tasks will have the biggest impact on the health and wellness of your reef tank inhabitants, there are certain weekly maintenance tasks which should not be disregarded. Even natural seawater’s pH (typically 8.0 to 8.3) may be suboptimal for some of its creatures. 2245 views. Rather like maintaining the right tank temperature, you stand a better chance of keeping pH in your chosen range if you check the level often. That is why it is very important to measure the pH level in an aquarium before releasing fish to it. Calcification by many organisms is known to depend on pH, at least in laboratory tests, often dropping as pH falls below normal levels. It is, therefore, difficult to justify a claim that a particular pH range is “optimal” in an aquarium housing many species. At present, however, it is not clear whether these open ocean results extend to other species, or whether a coral reef aquarium responds more like this open ocean test, or tests in more controlled environments. That is, these changes are no more stressful than being at the same pH all day. Whether your aquarium is a freshwater tank or a marine coral reef, your fish will be happier when you keep a stable pH value. That dissolution begins somewhere below pH 7.7, with the exact value depending on the alkalinity, calcium, and how long one is interested in waiting for it to happen. I prefer to keep my dKH and Cal a little higher than natural seawater around 430ppm of cal and 9.6 to 9.8 dKH as those are the levels of my salt mix helping me avoid any swings in parameters during … However, some aquarists do find pH to be too high (usually only when using limewater) or too low (most often from too much carbon dioxide in their home’s air). When the value of pH rises, it increases the ammonia level in the aquarium water which is very toxic to your fish. I won’t go into the reasoning behind this claim here, other than stating that it is my opinion, based on my understanding of how most organisms control their internal pH, but I do not believe that diurnal pH changes that stay within the range of pH 7.8 to 8.5 are particularly stressful to most reef organisms.
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