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Old 02-24-2004, 02:46 PM   #1
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replacing LR

I recently went to a club meeting in my local area and got to hear Bob Fenner (author of The conscientious Marine aquarist and Reef invertebrates for those who don't know him) speak. one thing he said that kind of surprised me was that we should be changing out a portion of our LR every year and a half, and if we don't, it will have a greater chance of crashing.

Does anyone do this? has anyone had experiences of their tanks crashing after this long? just curious about what others have to say about it.
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Old 02-24-2004, 02:54 PM   #2
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Here's the only thing that I think I could get out of this. I don't know about anyone else, but when i move my rock, a lot of crud starts floating around. I almost think that It may be a good idea to do a saltwater rise with the rock every year and a half or so, but as far as removing it completely, I don't see the logic behind it.
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Old 02-24-2004, 03:12 PM   #3
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Quote:
I recently went to a club meeting in my local area and got to hear Bob Fenner

Awsome dude.

My guess on the logic would be that over time in our closed systems the diversity of life forms on the rock is slowly lowered to where its more a small subset of promonite microb life. Regular additions of new live rock would keep the diversity of the entire system up.

Also over time our rock will naturally shrink as the calcium carbonate in the rock disolves.
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Old 02-24-2004, 04:32 PM   #4
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If you do change out a portion of the rock every 1 1/2 years, you will never get the look of the tanks that have been set up for 5+ years and look as though they were taken from the ocean. One of the biggest elements of getting a reef tank to look like the real thing is to just leave it alone.

He is much more educated than I, and I would love to hear his reasoning behind this. But the true "reef" look will never be accomplished.

I have been in this hobby for a long time and still havent read that book...I really should go get it.
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Old 02-24-2004, 05:20 PM   #5
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I would say the theory stems from DR Ron's salt studies where he concludes that the sand and LR take up heavy meatals in the salt mixes, once they are full they start releasing them back into the water. The "Old Tank Syndrome" Theory, which is why your seeing alot of folks pulling their DSBs and going back to bare bottom tanks.
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Old 02-24-2004, 07:21 PM   #6
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I thought the OTS had been proven incorrect provided that you have the proper infauna to aerate and shift the DSB.

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Old 02-24-2004, 07:29 PM   #7
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I think the thinking now is that they are very big sinks. They will hold the heavy metals and phosphors for only so long and then they crash. I also don't see how aerating or sifting would remove heavy metals from sand or rock.

I am also not saying I subscribe to the heavy metals theory, simply pointing out that might be a reason why Fenner would recommend replacing some rock every so often. I do find logic in the DSB being a sink. All the detritus and waste processed by the sand has an end product, not all of that end product is nitrgen, this is sunk into the DSB, over time the sulfide layer creeps ever so slowly upwards until there are problems all over the place.
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Old 02-24-2004, 07:30 PM   #8
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I thought the OTS had been proven incorrect provided that you have the proper infauna to aerate and shift the DSB.
I think RR is speaking of OTS as in the fact of the SB and LR absorbing heavy metals over time via food, salt mix, etc... No matter how much infauna you have, that won't make a difference to the toxic metals "sucked" into the LR and SB.

But unless we use plastic rock and bare bottom tanks, there is no way to prevent this. At least this is basically the view that I believe Dr. Ron takes...
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Old 02-24-2004, 08:51 PM   #9
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So does this mean that if you don't change out the stuff, in the future you'll lose everything?
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Old 02-24-2004, 09:18 PM   #10
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The theory is that the rock and sand will suck up metals to a point of saturation, then they start releasing them back into the water column and the tank experiences unexplained deaths, algae blooms and crashes.
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