![]() A test result that is not reproducible usually gives false measurements. Repeated measurements should always deliver the same results. Make sure that the color card of the test is finely graduated and the test is easy to read. It’s important to use trustworthy tests that provide reliable results - so better spend a little more money, it’s worth it. That means you should measure less than 1 mg/l Nitrate and less than 0,05 mg/l Phosphate. ![]() The modern reef aquaristic prefers another approach: The nutrient values have to be low, virtually on the detection limit, just like in the ocean. Nevertheless a SPS aquarium with high nutrient values and beautiful colors is possible. Zoxanthellae are always brown so the higher their density the more the brown algae overlay the actual color of the coral. With these nutrient values very rich colors can be achieved, but then the colors are very dark and can get dark brown easily, because the density of Zoxanthellae increases. Here the opinions tend to differ: The „old school“ recommends higher nutrient values, that means about 20-30 mg/l Nitrate and about 0.1-0.5 mg/l Phosphate. However the nutrient values are crucial fort he character of the SPS corals. They have no direct influence on the coloration of the coral but water additives, trace elements and other tricks don’t work if these parameters get out of hand. Calcium (420 mg/l), carbonate hardness (7-8 °dKH) and Magnesium (1320 mg/l) should be kept on a normal level. ![]() 1) Check water equivalents regulary and keep them constantĪs simple as it may sound: The basic requirement for well colored corals are the water equivalents.
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