Brackish Tanks - Page 2 - Puffer Fish Information - Pufferfish, Boxfish, and Cowfish
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post #11 of 14 (permalink) Old 04-17-2010, 01:18 PM
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Originally Posted by LoganLennox View Post
Thats what I'm saying, in order for me to get any hydrometer or refractometer any pet store here charges an insane amount of money. So instead the store is willing to just measure the salinity for me. Thus my current issue of not knowing how much to add at a time, and If I add a 1/4 cup of salt to the tank it would probably work out to more than a .002 incrase at a time. .002 salinity is not very much at a time but I don't want to over do it and risk killing the plants or fish. And I thought climatizng the tank to brackish conditions should be taken over several months not several weeks?
it is only a $12 hydrometer shipping will drive it up if you can't find it locally though.

you don't want to add salt directly to the tank. you should be doing weekly water changes in the magnitude of 25 to 50 percent and that is a good way to slowly increase your salinity. Several weeks is fine, as long as you keep it to increases of ..002 per week.
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post #12 of 14 (permalink) Old 04-18-2010, 09:12 AM Thread Starter
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Thanks Darb. It's obvious to me the pet stores are only trying to make money with the equipment and only selling expensive brands, so is that a trustworthy link? I mean have you ordered from there yourself? A similar one here costs $22 and it only measures as low as 1.012.

But, according to the link you gave me its the Specific Gravity I'm increasing by .002, so whats the salinity value for? I'm just assuming the two are related, like adding salt increases gravity? Anyway, the important question is should the water I'm adding be .002 or to full brackish conditions because it dilutes?

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post #13 of 14 (permalink) Old 04-19-2010, 07:25 PM
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Originally Posted by LoganLennox View Post
Thanks Darb. It's obvious to me the pet stores are only trying to make money with the equipment and only selling expensive brands, so is that a trustworthy link? I mean have you ordered from there yourself? A similar one here costs $22 and it only measures as low as 1.012.

But, according to the link you gave me its the Specific Gravity I'm increasing by .002, so whats the salinity value for? I'm just assuming the two are related, like adding salt increases gravity? Anyway, the important question is should the water I'm adding be .002 or to full brackish conditions because it dilutes?
J and L is a reputable on-line retailer, I have never order from them, they are 15 minutes from me. The salinity scale is Parts Per Thousand and apparently considered to be obsolete, or at least according to the article that I googled. Specific gravity is just a measurement of dissolved salt relative to pure freshwater which would be zero. Thus you are measuring how much more dense the salt/brackish water is relative to fresh water.
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post #14 of 14 (permalink) Old 04-19-2010, 10:17 PM Thread Starter
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Ooohhhh... lol I barely made it thourgh chemistry but I'm tring to understand it all, thus so many questions. The obsolete part is where refractormeters come in as the newer way of doing things? I don't think I'd need it that specific but if I'm planning on having multiple tanks I'm at least going to need something. It's just hard to trust something online when you have so many options and so little knowledge. Appreciate the site and the help Darb! Thanks a lot!!

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