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Old 11-17-2008, 11:32 AM   #1
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Lightbulb What is my optimal saltwater gravity

I have been toying around with what would be exactly the optimal salt water gravity for my particular system. I heard that coral like a sg around 1.024 - 1.025 ? although I have been maintaining my sg at around 1.022 most of my species of corral seem fine except this older star polyp that I guess has gone dormant in parts I am slowly trying to nurse this guy back to good health (any ideas?).. all my fish and shrimp seem to like it I have read this lower salinity is better for them.. does anyone think the salinity poses a problem?

Water conditions:

ph 8.0
amonia 0 mg/l
nitrogen > or = to .3 mg/l
phos 0.5 - 1 mg/l
calcium 450ppm (high?)
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Old 11-17-2008, 11:46 AM   #2
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Specific Gravity can be maintained lower in fish only tanks. 1.020-1.027 is usually a safe bet. Stability is the main key here most inhabitants will adjust. If you have constant SG swings it can be stressfull. I maintain my SG around 1.026 with evaporation it probably hits 1.027 I have no issues other than Salt Creep all over my equipment. 1.024 is a safe# with a decent amount of evaporation it won't get too high
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Old 11-17-2008, 12:21 PM   #3
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I have to agree that stability is a big key when it comes to stability. I like to keep in the 1.024-1.025 range. But keeping it stable in that range is much more important.
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Old 11-17-2008, 01:04 PM   #4
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Natural sea water is 35ppt or 1.026.
Good article. Reef Aquarium Water Parameters
You calcium is OK, but phosphate is too high.
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Old 11-17-2008, 02:43 PM   #5
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I keep my system at 1.025.

What is your Alk?
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Old 11-17-2008, 03:21 PM   #6
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I used to keep mine at 1.020 and when I moved up to 1.024, my hitch hiker corals really started growing like crazy.
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Old 11-17-2008, 04:05 PM   #7
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I'm a 1.025 guy too.
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Old 11-17-2008, 06:13 PM   #8
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my alkalinity is around 11 dkh (seems OK)
or so and my phosphate is a typo its actually around 0.05 - 0.01 mg/L so I think thats good I also think I will bring my salinity up a touch with saltwater top offs 0.01 er so a week
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Old 11-17-2008, 07:27 PM   #9
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Sounds good. What test kit are you using that measures phosphate that low? Usually you need a good, very expensive colorimeter to read down to 0.01. Even the Hach Pocket Colorimeter II only reads down to 0.02 and that runs $385.
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Old 11-17-2008, 11:31 PM   #10
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actually my bad you were right I am at 0.5~1.0 I do seem to have an algae on my glass / some of my returns power heads just a bit not much though, I added three hermits and I do 10 percent h20 change religiously weekly. The locals here told me that 1 mg/L was acceptable threshold and suggested phosguard, however I don't like dosing my tank, I want to control things as natural as possible, the folks who told me this for what its worth also run a shop with quarantined dead animals in thier displays and have coral tanks over run with algea. Do you have any Ideas how to lower it further without dosing, I am open to any suggestions you may possibly have...
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