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Old 03-20-2009, 04:31 PM   #11
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alright thanks a lot im just registering to the site as we speak
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Old 03-20-2009, 05:08 PM   #12
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I'm not sure if you really want to go into changing salinity without some experience under your belt. That could prove devastating to your tank and your project....
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Old 03-20-2009, 05:09 PM   #13
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well i was actually thinking about just having a tank without anything living in it and maybe just LR and see how the salinity affects the nitrogen cycle
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Old 03-20-2009, 05:49 PM   #14
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The way to do any sort of experiment like what you're thinking is to have multiple tanks. You want all variables to be the same except the one thing that you are trying to see the effects of. So for instance you could set up 3 10g tanks with salinities of 1.024, 1.020 and 1.016 and the same poundage of LR in each and track your nutrient levels through the cycle. Each tank would need the same conditions, i.e. temperature, salt type, anything you add to one you add to all.

Changing the salinity over the course of the cycle in one tank won't really tell you much, because different salinities could have different effects on different parts of the cycle, and you won't be able to tell the effects apart.

You could set up a tank with different lighting at the two ends and grow several different types of corals under each type of light. You could use two different types of light with the same color bulbs (i.e. PC vs T5), or the same kind of light with two different color spectra (ie. both PCs but one with 10000K only and one with 10000K/actinics). Light would be the only thing that would be practical to vary within the same tank, really, as temp, salinity and nutrients are going to be the same throughout. You'd want to make sure to place the corals the same distance from both light sources but that would be relatively easy.
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Old 03-21-2009, 01:31 AM   #15
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I agree, whether it is SW, FW, brackish, I don't think salinity (unless it changes drastically during the cycle) will prove much of anything...the cycle is the cycle..if you go (to make it easy) from SW salinity to none, I imagine it would kill off the beneficial bacteria.
How about how a fish can adapt to a FW environment to a SW environment, through the slow process of acclimation...like a molly..the freshies/brackish folks might be able to help...
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Old 03-21-2009, 02:09 AM   #16
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FW fish can adapt to SW???
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Old 03-21-2009, 02:25 PM   #17
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Certain FW fish can adapt to SW. I've seen guppies, mollies, and swordtails in SW tanks.
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Old 03-21-2009, 05:49 PM   #18
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what!!!! that's so awesome... im not so sure about this though...
our school is against experimenting on animals and stuff....
and this seems like if something goes a bit wrong it could kill the fish...
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Old 03-21-2009, 08:04 PM   #19
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Instead of coral as that can be a little more expensive it seems... You could always do the documentation of symbiotic relationships between say a pistol shrimp and goby or a mated pair of gobies and a mated pair of pistol shrimp. I am fairly new to this also so this may or may not be a viable idea. It is a suggestion that I think would be interesting. You can keep a day to day doc. As well as pictures and video of the interactions between the two.
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Old 03-22-2009, 11:27 PM   #20
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GhostKnife, that is a decent idea, the only issue I can think of is you'll rarely see the pistol......
Symbiosis is a great idea though!
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