<a href=showthread.php?s=&postid=7572888#post7572888 target=_blank>Originally posted</a> by Sk8r
Try to get to:
alk: 8.3-11
cal: 400-420
salinity 1.024-6
temp 80
mg. 1200
phosphate 0
ammonia 0
nitrite 0
nitrate 0...
And I absolutely agree: get a TDS meter [total dissolved solids] and test the water of that fish store you have been relying on.
When you have problems that defy solution, best go to a) what's unusual [you've answered that], and b) what have I trusted without question [that fish store.]
I gotta put my own two cents in on this, though Sk8r's is just fine.
Alk: 7-11 dKH
Calcium: 360-480. This depends on what type of tank you are keeping. A Clam/SPS tank should have around 450ppm but not over 480ppm. A mixed tank is advisable to keep at Natural Sea Water levels; 380-420ppm.
Temperature: 80ºF This allows for a safer, natural fluctuation. If it varies up to +/- 2ºF, then you are still good to go. Of course, long term success means stable parameters.
Specific Gravity: 1.022-1.027 1.025 is prefered and 1.025-1.026 is Natural Sea Water.
Magnesium: 1250-1300 ppm This is where I disagree with Sk8r. Magnesium helps the control the amount of Calcium in water before it percipitates out.
Ammonia, Nitrite, Nitrate, and Phosphate: 0ppm Though you can have a successful mixed reef with Nitrates up to 20 ppm. It isn't recommended though. Even a FOWLR or FO can see large amounts of 40-80ppm and thrive. But you have to remember, nitrates inhibit cellular growth.
***FWIW, don't think that you have it bad. It's not that bad. My friend and me have been working on a severely neglected 300g tank. It was eight years old without a waterchange, bioballs, and crushed coral before we began work on it. Nitrates were off the charts on all test kits. It was only a matter of a couple seconds for it to max. Most Nitrate test kits make you wait anywhere from one minute to five minutes, but we maxed the chart in 1-2 seconds. After weekly 50% water changes, we eventually got it to a readable level. We were guessing that the Nitrates were in the range of 800ppm. We were surprised that life was still in the tank.