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Regarding snails: if you start getting much lower, you'll find holes in your snail shells. Clams and corals, snails, aragonite, all dissolve as the water balance gets wonkier. If you want stony corals to grow, keep the calcium at 420. If you don't have stony coral you can go lower, but keeping it at that level keeps it 'available' on call, and a feeding stony can take down an amazing amount of calcium in a single day, enough that it will stress other creatures in the tank and cause problems. Mg/cal/alk exist in a balance. If you keep the mg up and keep providing calcium at 420, the system will stay bulletproof for months.
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Sk8r
Salinity 1.024-6; alkalinity 8.3-9.3 on KH scale; calcium 420; magnesium 1300, temp 78-80, nitrate .2. Ammonia 0. No filters: lps tank. Alk and cal won't rise if mg is low.
Current Tank Info: 105g AquaVim wedge, yellow tang, sailfin blenny,royal gramma, ocellaris clown pair, yellow watchman, 100 microceriths, 25 tiny hermits, a 4" conch, 1" nassarius, recovering from 2 year hiatus with daily water change of 10%.
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