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Old 09-24-2003, 05:52 PM   #11
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The second reason you'd want a plenum is b/c the sand (being fine) takes up more space that could be used by bacteria.
ahh but very little bacteria is suspended in the water column. The bacteria actualy colonizes the surface of the substrate. I believe one of our articles in the Articles Section discusses the theories behind this method of denitrification and the amount of occupiable surface area in a DSB.
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Old 09-24-2003, 07:37 PM   #12
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Having critters turn the sand of is acutally desired to some degree. Im not refering to like a total turn over of the sand bed every day or week but having small worms, mini starfish and small crustations moving about the sand bed allows the bed to remain fluid.

Sand being fine gives more surface area for bactera to live. Sand being fine will also not trap detruis to the degree that the larger crushed coral substrates.
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Old 09-24-2003, 08:30 PM   #13
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That makes sense. Live and learn, at least I'm doing it prior to setting up the tank and dealing with issues as the arise.
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Old 09-24-2003, 10:02 PM   #14
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IMO, if your going for an anoxic area, save yourself the hassle of making a plenum and just make it a solid DSB.
I agree. With a DSB, its just glass, sand, then rock, NO mesh. A plenum, although not a terrible idea, is less stable then a DSB.....as you would naturally assume being that they are not natural occurances. I have read a TON of reports about plenums failing after a short (couple of years) time, and leeching posphates and nitrogen based chemicals back into the tank, which is usually devastating to the tank. They use a plenum at the LFS in their bad *** reef display, but it has a tube sticking out of the sand to allow for at least some water exchange. A plenum is like a UGF, but more constricted. I personally chose against a plenum for my new setup, and went with a 5" DSB, and my buddy did a plenum in his at the same time. It may be coincidence, but he is not seeing the nitrifying process like I am, and he continues to have raising nitrates...........as of a couple of weeks ago. I should check in on him and see how its going. HTH.
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Old 09-25-2003, 04:42 AM   #15
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fgfgfg
plenum? learn something new everyday! I'll have to read up on how to go from CC to DSB now...hmmm
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Old 09-29-2003, 01:25 PM   #16
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Ok, I went and picked the tank up yesterday. Talk about gross. The guy was giving it away b/c it belonged to his roommate who skipped town and rent on him. It was a FW setup that the current roommate continued to feed, but not maintain. It had lost about 1/2 the water and as the water evaporated it left algea plastered to the acrylic. So I kept the fish, emptied everything else and threw away all the equipment etc as I won't be able to use it for my SW setup. It did have a 1 bulb flourescent but that would be massively inadequet for my purposes. 1hr of emptying at his place and 2 hrs of scrubbing later, the tank looks **** near brand new. Amazing.

Ok, next step: making reef ready. I read it somewhere but I lost the place, for the drain to the sump, there's a ration of inches in length as a ration of the tank that should be used for the over flow.
#1 Does anyone know this calculation?

#2 The back is clear and I"d like to have it black. What paint is safe to use, or is there a material you can put back there instead. I don't want any chemicals leaching into my system.

thanks
e
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Old 09-29-2003, 01:41 PM   #17
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#1) I don't know it off hand, scour our DIY Section, you should be able to find it there.

#2) any acrylic paint will work just fine. I believe I hear the most folks just use spray paint for ease of use and the fact that it scrapes off with a razor easily if you want to remove it for any reason. one note of caution; If your going to use spray paint I would cover the top of the tank to be sure nothing gets into the tank itself.
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Old 09-29-2003, 07:35 PM   #18
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I'm looking to buy some more hardware, but I didn' tknow if any websites were reputable and cheaper than LFS. So I thought I'd ask the experts, so far I've mainly been looking at marinedepot.com which has better deals than my LFS.

The two items I"m hunting for are:
Lifeguard Quiet One 4000
AquaC Urchin Pro

Any shopping advice is apprecaited.
e
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