Snails and corals are especially susceptible. It's like that all over my tank. The sand bed ranges from 15-50. http://brs.li/BRSMagnesium Did you know that magnesium is the element that essentially makes reefing possible? butcherman. i would like to know the negative effects of magnesium being too high in a reef tank . I’ve never personally had many problems with hair algae until now, so we decided to give magnesium a try and find out if the stories were true. I fought off filament algae in one of my smaller reef tanks by bringing the magnesium level to 1800 a few years ago. A lack of regular water changes to replenish consumed magnesium will lead to low levels as well. Figure 14 shows the depletion of magnesium at a high depletion rate with daily water changes amounting to 0%, 7.5%, 15% and 30% per month. High Magnesium - Just tested my magnesium the other day for the first time in awhile.It's 1700 to 1720 tested 3 times with a Salfert test kit.Not sure why or how it got there.Don't dose anything but High Magnesium - The Reef Tank I know people do it, but this is not a method of algae control I would use. Therefore something is added in the first step of the test to precipitate the magnesium. I was using IO Reef Crystals from the start and my Mg ran a little high but now that I have filled the tank with coral it runs on the lower side of the range. 75G sumpless/RO HOB Classic 90 Skimmer/18W UV sterilizer/2 AI Hydra 52 LEDs|28G Nano Rapidled Canopy kit/Auqamaxx Skimmer So could it be my lights causing sudden death? Could high mag levels cause corals to randomly die like that? i cant be a COMPLETE idiot cos some PARTS are missing! A common cause of low magnesium is failing to use a salt specifically designed for reef tanks that contains the proper magnesium levels. A reduction in nutrients is the way to go. To make sure all the algae was gone, I followed this by blacking out the tank for 4 days directly after the elevating the mag levels. Joined 7 Sep 2009 Posts 11,787 Reaction score 325 Location Kempton Park. My calcium is now at 460 (had been at 400), but I was most surprised by my magnesium… Aside from some snails and hermits dying, the corals didn't seem to take any ill effect. How to Fix: Tip #1: Perform regular water changes with a salt designed for reef tanks. Alk is 9.6 and calc is 460. Is a magnesium reading of 1440 ppm too high? Detailed information about the most important water parameters in a reef aquarium. Just keep testing it. I just switched salt mixes - I had been using Instant Ocean, but was finding my calcium and magnesium levels too low. concentrations greater than 1500 mg/L) were a great way to battle hair algae outbreaks. Other possible problem I can think of is my alk is around 8 pretty consistently and cal around 400-420 yet my magnesium stays ups around 1500-1600 and I don't dose magnesium. The indicator that is used reacts mainly with calcium and magnesium. I've removed and replaced my sandbed over the last 3 weeks resulting in more water changes than usual and I have only ever dosed magnesium once which was 1 month ago which got my level to my target of 1300. Moderator. For years, hobbyists have known that elevated magnesium levels in their aquarium (e.g. So I bought some Seachem Reef Salt, and did a 25% water change. ... but in my opinion corals need iodine. Long term high levels are toxic. Increasing mag like this will alter other chemicals in the tank … 18 Oct 2011 #2 Define to high? My lights causing sudden death is the element that essentially makes reefing possible are missing years. I would use could high mag levels cause corals to randomly die like?... 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