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Old 03-20-2014, 02:13 AM   #31
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experience with kalkwasser

Test the fresh saltwater once you mix it. Something is crashing the alkalinity.
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Old 03-20-2014, 02:46 AM   #32
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i tested a fresh batch a month ago when i started using it and got 9 dkh. product states it should be 10 but pretty close
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Old 03-20-2014, 02:48 AM   #33
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ive mentioned this before but could it be my deep sand bed??? i neglected parameters in this tank for about a year no corals died but none thrived
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Old 03-20-2014, 03:57 AM   #34
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Your tank could be going acidic. Older tanks that build up detritus or dirty sand beds can cause this. Over time clean various parts if the system and sand bed, but do it very slowly as you may release DOCs into the water. Best time to do this siphoning is before a water exchange. Keep up the water exchanges and you could add some baking soda to the new saltwater. Don't ever add much at any one time. Bake the baking soda on a cookie sheet for an hour at 350F. That turns it into sodium carbonate that will add alkalinity and not mess with ph as much. Just a tablespoon for about each 100 gallons. That will help alkalinity and that in turn will help stabilize ph. Add it along with the water exchange or slowly to the sump.
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Old 03-20-2014, 09:57 AM   #35
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wow i just read an article on that it makes perfect sense. how much sand do you think i can safely siphon out at a time. its a 3" sand bed in a 25 g tank. but there is 50 gal total water volume
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Old 03-20-2014, 10:49 AM   #36
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ill only have this tank for another 6 or 8 until my new one is ready for me to transfer the livestock over. now this raises another big question. do i want another dsb? i read that organic acid is a byproduct of the critters in the sand bed, so is this something that ppl with a dsb need to compensate for? also my tank is old but not that old, 5 years or so. there was a couple years where i rarely did water changes but was dosing (this was my first reef tank so there has been alot of experimentation). it seems the more i learn the more i realize i dont know
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Old 03-20-2014, 10:49 AM   #37
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"6 or 8 months"
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Old 03-20-2014, 12:21 PM   #38
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IMHO deep sand beds are more trouble than there worth. I find it easy to clean a section of my sand every other week (about 25% each time, takes 2 months to get to the whole thing) with out causing any spikes. I think it helps me keep my nutrients low, but there's no way I would do this with a DSB because I'd be afraid of what I released.
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Old 03-20-2014, 01:37 PM   #39
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doesnt cleaning a sand bed remove the beneficial bacteria and organisms?
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Old 03-20-2014, 02:36 PM   #40
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I think DSB is more trouble than they are worth. They can trap toxic elements that can nuke your tank if you disturb them. If your going to upgrade, just leave it alone. Disturbing it could cause all sorts of problems.
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