Reusing water for WC

Jmas4

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Hypothetically, could you reuse water from an different tank to change the water in a fowlr? I do not have a fowlr but I do have a reef tank. In this reef, my pH, alk, cal, nitrates and phosphates are all in the correct range to grow coral. My dosing and WC regimen keeps these parameters stable. Therefore when I do WC it is for replenishing trace elements and slight reduction in nutrients. So the water taken out is not technically dirty or wrong chemically. Then can't you reuse this water to do a water change on a fowlr? Fish are not as sensitive to nitrates and phosphates and I do not think they will mind a lack of trace elements.
To add another step if I add extra ro water to increase the % of water change for the fowlr without adding salt and I lower salinity, I do not think the fish will mind this either correct?

Thanks and Happy Reefing!
 

X-37B

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Hypothetically, could you reuse water from an different tank to change the water in a fowlr? I do not have a fowlr but I do have a reef tank. In this reef, my pH, alk, cal, nitrates and phosphates are all in the correct range to grow coral. My dosing and WC regimen keeps these parameters stable. Therefore when I do WC it is for replenishing trace elements and slight reduction in nutrients. So the water taken out is not technically dirty or wrong chemically. Then can't you reuse this water to do a water change on a fowlr? Fish are not as sensitive to nitrates and phosphates and I do not think they will mind a lack of trace elements.
To add another step if I add extra ro water to increase the % of water change for the fowlr without adding salt and I lower salinity, I do not think the fish will mind this either correct?

Thanks and Happy Reefing!
That should not be a problem at all, imo.
 

nereefpat

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Hypothetically, you could do that. It would be worth doing if the water you pull out of the reef is "clean." I've filled my QT that way.

My water change water is really dirty, and full of algae and cyano.
 

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