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Old 04-07-2011, 09:23 AM   #11
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Yeah, that's what I've heard is that 1.026 is where you should be for a reef, and debating answers for FOWLR and FO tanks.
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Old 04-07-2011, 11:31 AM   #12
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1.026 is absolutely nothing to worry about. Ocean water has an SG of 1.027. Just go a little light on the salt for your next water change, I keep my tank between 25-27. Back in my early days before I knew what a refractometer was, I was keeping my water at 1.030 because my hydrometer said it was 1.024. But that was long ago, never had a loss from it.
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Old 04-07-2011, 11:53 AM   #13
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Originally Posted by iDreamInSaltwater View Post
Yeah, that's what I've heard is that 1.026 is where you should be for a reef, and debating answers for FOWLR and FO tanks.
I know FO/FOWLR are often recommended to be kept at lower salinities than reef, but I've never really seen a good reason given for that. Fish are fish and they live in the ocean - which has a salinity of 1.026-1.027, on average. For the long term health of the fish, they should be kept in the environment they're made for. The whole "lower salinity prevents disease" doesn't scientifically hold true when you look in to it. The only thing good to be said about lower salinity is that you save $ on salt - but that doesn't really help your fish much.
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Old 04-07-2011, 12:04 PM   #14
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I often wondered where the lower salinity numbers came into play, I was told by my lfs they can more efficiently profuse oxygen and food and therefore create less waste in lower salinity. The whole intent is to reduce the amount of waste put on your filtration, I have no idea how accurate that is. Lol
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Old 04-07-2011, 12:21 PM   #15
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Oh well all of that is very good news!

Before I read this, anyways, I exchanged a gallon of my tank water for a gallon of freshwater and got it down to 1.025.

I think I'll try to slowly bring it down to 1.024 and keep it there (it seems a safe, in recommended range, number)

All my fishies are golden
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Old 04-07-2011, 12:53 PM   #16
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Oh here's a good question.. as water evaporates does the SG go up?
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Old 04-07-2011, 12:54 PM   #17
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Not usually, salt creep occurs.
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Old 04-07-2011, 04:42 PM   #18
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It does actually. The water evaporates, but the salt doesn't, even if you're getting salt creep.

Hence why you top-off with FW, to put the salinity back in check, replace only the water that was evaporated, not the salt.
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Old 04-08-2011, 10:46 AM   #19
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Yep, SG will rise as evaporation occurs.. Thats where an ATO comes in handy.. I have been running my tank at 1.023, its FO, using a swing arm hyrometer.. Just got my refractometer last night and checked it, according to that its at 1.028.. DOH! From what I understand with the lower salinity in a FO/ FOWLR it allows more O2 in the water and also helps with parasites/infections in the fish.. Read that a few times not sure if it is true.. Also it saves salt running the tank at 1.022 compared to 1.028..

Shane.
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