SG - 1.025 or 26
- Thread starter panic
- Start date
seattlerob
New member
I keep my salinity at 35 ppm, which is specific gravity 1.026. I would agree probably not much difference, if any, between 1.025 & 1.026.
Neither related to pH
hth,
rob
Neither related to pH
hth,
rob
RockyMtnReef
Member
I heard something interesting the other day. I have a LE coral from Steve Tyree (I know, I know) that I am ready to take delivery of. I asked what his parameters are to make sure mine werent way different and was shocked to find out he keeps his SPS at a SG of 1.0225. He said he didnt see the same colors at the higher SG. Has anyone else tried this? I was pretty suprised but I guess his success speaks for itself.
RichConley
New member
The fact that he has great success doesnt necessarily mean the low salinity is whats doing it. Its just as likely that his corals do that well in spite of his low salinity because he does such a good job in other areas.
Amphiprion
Premium Member
I keep mine consistently around 1.026-1.027.
seattlerob
New member
panic: from information I'm finding on www.seafriends.org.nz/oceano/seawater.htm, it appears NSW ranges in salinity from 32-40 ppt, but the average does appear to be 35ppt, or 1.026 SG.
There's a cool world map on that page that shows salinity based on geography. Looking at the areas that most corals are collected from, 35ppt looks just about right.
hth,
rob
There's a cool world map on that page that shows salinity based on geography. Looking at the areas that most corals are collected from, 35ppt looks just about right.
hth,
rob
seattlerob
New member
panic: also, about your question regarding Alk and SG, yes, I believe that is true. I believe Alk, Ca, Mg all are in relation to SG. Of course, those are consumables whereas SG isn't consumed (actually goes up with evaporation). But I believe when most people talk about maintaining Alk, Ca & Mg at certain levels, that's with the understanding that SG is right about 1.025-1.026.
rob
rob
Eric Boerner
Coral Cutter
Mine is kept at 35 ppt @ 82 degrees which is 1.024 SG.
Dont forget, temp effects SG readings. If you're running at the avg temp of 82, your SG reading will result in a higher PPT reading.
¢ªF (¢ªC) 1.020 1.021 1.022 1.023 1.024 1.025 1.026 1.027
74.0 (23.3) 28.0 29.3 30.6 31.9 33.3 34.6 35.9 37.2
75.0 (23.9) 28.2 29.5 30.8 32.1 33.5 34.8 36.1 37.4
76.0 (24.4) 28.4 29.7 31.0 32.3 33.7 35.0 36.3 37.6
77.0 (25.0) 28.6 29.9 31.2 32.5 33.9 35.2 36.5 37.8
78.0 (25.6) 28.8 30.1 31.4 32.7 34.1 35.4 36.7 38.0
79.0 (26.1) 29.0 30.3 31.6 32.9 34.3 35.6 36.9 38.2
80.0 (26.7) 29.2 30.5 31.8 33.2 34.5 35.8 37.1 38.5
81.0 (27.2) 29.4 30.7 32.0 33.4 34.7 36.0 37.4 38.7
82.0 (27.8) 29.6 30.9 32.3 33.6 34.9 36.3 37.6 38.9
83.0 (28.3) 29.8 31.2 32.5 33.8 35.2 36.5 37.8 39.2
84.0 (28.9) 30.1 31.4 32.7 34.1 35.4 36.7 38.1 39.4
85.0 (29.4) 30.3 31.6 33.0 34.3 35.6 36.9 38.3 39.6
86.0 (30.0) 30.5 31.8 33.2 34.5 35.8 37.2 38.5 39.8
87.0 (30.6) 30.8 32.1 33.4 34.8 36.1 37.4 38.8 40.1
Dont forget, temp effects SG readings. If you're running at the avg temp of 82, your SG reading will result in a higher PPT reading.
¢ªF (¢ªC) 1.020 1.021 1.022 1.023 1.024 1.025 1.026 1.027
74.0 (23.3) 28.0 29.3 30.6 31.9 33.3 34.6 35.9 37.2
75.0 (23.9) 28.2 29.5 30.8 32.1 33.5 34.8 36.1 37.4
76.0 (24.4) 28.4 29.7 31.0 32.3 33.7 35.0 36.3 37.6
77.0 (25.0) 28.6 29.9 31.2 32.5 33.9 35.2 36.5 37.8
78.0 (25.6) 28.8 30.1 31.4 32.7 34.1 35.4 36.7 38.0
79.0 (26.1) 29.0 30.3 31.6 32.9 34.3 35.6 36.9 38.2
80.0 (26.7) 29.2 30.5 31.8 33.2 34.5 35.8 37.1 38.5
81.0 (27.2) 29.4 30.7 32.0 33.4 34.7 36.0 37.4 38.7
82.0 (27.8) 29.6 30.9 32.3 33.6 34.9 36.3 37.6 38.9
83.0 (28.3) 29.8 31.2 32.5 33.8 35.2 36.5 37.8 39.2
84.0 (28.9) 30.1 31.4 32.7 34.1 35.4 36.7 38.1 39.4
85.0 (29.4) 30.3 31.6 33.0 34.3 35.6 36.9 38.3 39.6
86.0 (30.0) 30.5 31.8 33.2 34.5 35.8 37.2 38.5 39.8
87.0 (30.6) 30.8 32.1 33.4 34.8 36.1 37.4 38.8 40.1
seattlerob
New member
panic: yeah, that is true, but did you also catch the last line in this paragraph:
This world map of ocean acidity shows that ocean pH varies from about 7.90 to 8.20 but along the coast one may find much larger variations from 7.3 inside deep estuaries to 8.6 in productive coastal plankton blooms and 9.5 in tide pools. The map shows that pH is lowest in the most productive regions where upwellings occur. It is thought that the average acidity of the oceans decreased from 8.25 to 8.14 since the advent of fossil fuel (Jacobson M Z, 2005).
Maybe this is a contributing factor to why many of the reefs of the world are not doing well? In other words, maybe closer to 8.3 is 'historically' where pH should be for reef environments, and perhaps corals thrive & survive better vs where we are now? Not sure, but for now I'm going to stick with 8.3
Rob
This world map of ocean acidity shows that ocean pH varies from about 7.90 to 8.20 but along the coast one may find much larger variations from 7.3 inside deep estuaries to 8.6 in productive coastal plankton blooms and 9.5 in tide pools. The map shows that pH is lowest in the most productive regions where upwellings occur. It is thought that the average acidity of the oceans decreased from 8.25 to 8.14 since the advent of fossil fuel (Jacobson M Z, 2005).
Maybe this is a contributing factor to why many of the reefs of the world are not doing well? In other words, maybe closer to 8.3 is 'historically' where pH should be for reef environments, and perhaps corals thrive & survive better vs where we are now? Not sure, but for now I'm going to stick with 8.3
Rob
Amphiprion
Premium Member
35 ppt (PSU) is the world ocean average.
