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Old 06-19-2012, 07:49 PM   #1
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Should i do a water change?

Last Monday I did a 10 gallon water change when my nitrates were at 40 ppm in my 75 gallon so I did a 10 gallon water change and today I tested and now it's at 10 ppm! I don't think a little 10 gallon would've dropped it that much? I have gotten some algae over the last week and phosphates are at 0.. Calcium is at 460. I have a 20gallon sump/refugium on it, I haven't done a water change in over a week and everything seems great! Do I still need to do one?
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Old 06-19-2012, 08:11 PM   #2
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Yes. Even if you're nitrates are at 0 you should still do them to replenish trace elements and just give the fish new water. It would be like getting fresh air for humans.
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Old 06-19-2012, 08:16 PM   #3
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Okay, what could be wrong with my GSP's? They were open this morning along with my cauliflower colt and now their both closed, one of the GSP frags fell off the rock but they wouldn't explain why the other one is closed! Would a 15 gallon change fix whatever the problem is?
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Old 06-19-2012, 08:21 PM   #4
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They could just be closed if something touched them.
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Old 06-19-2012, 08:27 PM   #5
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But it's weird how all 3 are closed, last time I had some GSPs the guy at my lfs said I should be dosing with iodine but I don't need to do that if I do my weekly water changes rights? I don't know how or if I can test for it!
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Old 06-19-2012, 11:50 PM   #6
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You don't need to dose. You only need to dose if you water changes don't keep up with corals. Don't dose what you don't test for.
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Old 06-20-2012, 12:07 AM   #7
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Quote:
Originally Posted by crister13
You don't need to dose. You only need to dose if you water changes don't keep up with corals. Don't dose what you don't test for.
what should the iodine levels be at?
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Old 06-20-2012, 12:21 AM   #8
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I don't know of anyone who tests or doses iodine. It doesn't really matter.
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Old 06-20-2012, 12:29 AM   #9
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Iodine is used by inverts for proper molting, and corals somehow. Don't exactly know how, chemically, but iodine is a necessary element.
But I agree with Crister, don't dose anything you don't test for. Proper iodine levels should be in your salt mix when you do pwc's.
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Old 06-20-2012, 08:29 PM   #10
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if you have algae growing thats probably whats bringing down the nitrates and phosphates
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