danilada Posted January 10, 2009 Report Share Posted January 10, 2009 How would I go about doing this? Tank is 120L and is housing one green spotted puffer, whom currently around 4-5cms is "freshwater" Filteration is a Fluval, suited for 300-400L, temp is 25'C. P.H 7.5 I am aiming for S.G to be around 1.018. All help is greatly appreciated. Quote Link to comment Share on other sites More sharing options...
Ira Posted January 10, 2009 Report Share Posted January 10, 2009 Bruy some artificial sea salt and a refractometer or hydrometer, as I've said in your other thread. 1.018 looks to be a bit too high to start with. Quote Link to comment Share on other sites More sharing options...
danilada Posted January 10, 2009 Author Report Share Posted January 10, 2009 I'll stick to one thread Sorry, 1.018 is what I am aiming the tank to be, once gradually changed. (hope that makes sense) How much salt to water should I add from Day 1? Quote Link to comment Share on other sites More sharing options...
danilada Posted January 10, 2009 Author Report Share Posted January 10, 2009 I am hoping for S.G to be 1.018 as I do not have a skimmer . . . yet! Quote Link to comment Share on other sites More sharing options...
chimera Posted January 12, 2009 Report Share Posted January 12, 2009 I am hoping for S.G to be 1.018 as I do not have a skimmer . . . yet! whats salinity got to do with a skimmer? amount to add is on the back of the bag - just be aware it changes with temperature so heat the water as well. best to add a little at first then measure and see what change X litres makes. then work out from there and bring it up slowly. Quote Link to comment Share on other sites More sharing options...
spoon Posted January 13, 2009 Report Share Posted January 13, 2009 bring the sg up slowly like 0.02 a week . you dont need a skimmer and it will not work very well at 0.018 aneway if you were to decide to go full marine 0.024 (i think) a skimmer would be a better option as its a very good from of filtration for salt water. you could also use a cannister filter or a sump filter but you would be doing a lot more waterchanges than if you had a skimmer and the salt can get expensive Quote Link to comment Share on other sites More sharing options...
smash Posted January 14, 2009 Report Share Posted January 14, 2009 Skimmers work fine at S.G 1.018 to 1.020. Alot of "fish only" tanks run at 1.018 to 1.020. At that level there is less stress on the fish, as they are purging less salt from their bodies, there for "spending" less energy. Quote Link to comment Share on other sites More sharing options...
Ira Posted January 14, 2009 Report Share Posted January 14, 2009 I'm skeptical that is the case. Fish usually do not need to purge salt as much as they need to retain water that would move out of their cells into the water by osmosis. If the salinity drops that basically results in huge volumes of water going into their cells and bursting them if they can not get rid of that water. Do you feel healthier and happier if you're stuck in a room that's at 98°F? I'd like to see proof that a lower salinity than a fish is evolved to handle is less stressful for it. Quote Link to comment Share on other sites More sharing options...
smash Posted January 15, 2009 Report Share Posted January 15, 2009 Freshwater fish is surrounded by water which is less dense than its body fluids. Due to osmosis, water is absorbed into the body and a fish must excrete water constantly so that it does not burst. The marine fish faces the opposite problem: it is constantly losing water to its surroundings so that it must drink copious amounts of water and excrete salts through the gills. So if there is a lower S.G, there is less energy loss to drinking and excretion of salts. Quote Link to comment Share on other sites More sharing options...
tHEcONCH Posted January 15, 2009 Report Share Posted January 15, 2009 I'm skeptical that is the case. Fish usually do not need to purge salt as much as they need to retain water that would move out of their cells into the water by osmosis. If the salinity drops that basically results in huge volumes of water going into their cells and bursting them if they can not get rid of that water. Do you feel healthier and happier if you're stuck in a room that's at 98°F? I'd like to see proof that a lower salinity than a fish is evolved to handle is less stressful for it. I agree - humans are 90% water - maybe we would all be happier sitting in a luke-warm bath? Quote Link to comment Share on other sites More sharing options...
I_am_Elmo Posted January 23, 2009 Report Share Posted January 23, 2009 I read an interesting article in Advanced Aquarists about this, the writer said lower salinity is less stressful for the fish, and "could" be used to help with acclimitising fish or getting finicky fish to eat. It did state in the article that they shouldn't be left in there for extended periods of time, from memory is was about 2-3 months. Quote Link to comment Share on other sites More sharing options...
tHEcONCH Posted January 26, 2009 Report Share Posted January 26, 2009 That's just rubbish - its about as scientific as astrology and often used as a weak excuse to skimp on buying salt and doing proper maintenance. When all is said and done the most successful keepers reproduce as close as possible the natural conditions of the fish / coral, and keep them that way - maintaining water quality is paramount. Boring, but paramount. Quote Link to comment Share on other sites More sharing options...
chimera Posted January 26, 2009 Report Share Posted January 26, 2009 I'll 2nd that Quote Link to comment Share on other sites More sharing options...
ninjafroglet Posted January 26, 2009 Report Share Posted January 26, 2009 I agree - humans are 90% water - maybe we would all be happier sitting in a luke-warm bath? Not so much, we're not made to handle constant water exposure, and out skin cells will burst :lol: Quote Link to comment Share on other sites More sharing options...
tHEcONCH Posted January 26, 2009 Report Share Posted January 26, 2009 Yes, and I go all wrinkly and horrible looking too! Unfortunately the kind of flawed reasoning my example was supposed to illustrate crops up quite often in this hobby - people like to second-guess nature for some reason. Quote Link to comment Share on other sites More sharing options...
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