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Old 09-30-2008, 10:10 PM   #1
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i hate to sound dumb but...

i'm new to this saltwater thing and have a quick question. When i do the water change this weekend how much do i take out and then can i reuse the water or do i sust get rid of it. i have a 29g biocube. I bought 30gallon pre mixed sw at the lfs. i have 10 gallon left. can i put that in a rubber made container with a ph and heater on it and keep it instead of haning to buy new all the time?
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Old 09-30-2008, 10:14 PM   #2
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Can't use the old salt water. Dump it.

How old is your setup and what's inthe tank?
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Old 09-30-2008, 10:21 PM   #3
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If you are willing to go the pre mixing (awesome idea!), buy your own salt mix and premix with a ph and heater for at least 24 hours. You want to match the temp and salinity to your tank's.
I have a 32G plastic trash can and keep it constantly mixing. Remember, the water will evaporate so yop off with FW. RO/DI is the best.
And no, you don't sound dumb. I had some of the same questions!

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Old 09-30-2008, 10:31 PM   #4
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Yeah as Ray said you just get rid of the old water. The trace elements have been stripped and it`s full of excessive nutrients. That`s the purpose of PWC`s to relenish trace elements and take out excessive nutrients like nitrates and phosphates. I would do 25% PWC`s.
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Old 09-30-2008, 10:38 PM   #5
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i started my tank on sunday. Right now the only thing that is in it about 14# live rock, 20 pound live sand and some crushed coral/seashells. There are a couple of snails and crabs that where on the rock.
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Old 09-30-2008, 10:42 PM   #6
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What do you mean "started"? Cycled? How?
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Old 09-30-2008, 10:44 PM   #7
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i bought tank on saturday, put water, substrate, rock in on sunday that is what i mean by started
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Old 09-30-2008, 11:42 PM   #8
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Um.. So did you just buy a tank put salt water in it....

.. and then just threw rock and inverts in there right away?
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Old 10-01-2008, 12:51 AM   #9
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Bubby, sorry if we seem impolite, but the previous are standard questions.
I think the question is what did you use as an ammonia source, to kick off your cycle?
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Old 10-01-2008, 01:09 AM   #10
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Sounds like a little reading on cycling the tank might come in handy. Here's a good article...

http://www.aquariumadvice.com/articl...ank/Page1.html

Before you start stocking the tank with critters, you need to make sure there's a population of bacteria living in the tank. That bacteria is really important because it's going to do the job of converting the ammonia (from fish poop, fish breathing, leftover food rotting away, etc) into something harmless to the fish/coral/crabs/etc. Ammonia is toxic to live stuff, but the end result (nitrates) is NOT toxic. And that's where the water changes come in... to get rid of the nitrates.

Read over that article, and also the ones in roka64's signature block, and hit us with more questions. We've all been down this road and have asked "dumb" questions ourselves.
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