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Old 06-30-2006, 01:05 AM   #1 (permalink)
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Skimmer break-in period ?

Hey guys,

From what I've read so far... It looks like I may need to run my new skimmer for more than 5hrs before it actually starts to skim.

I'll give you all some info, and it would be great if you could throw me some hints or a yes/no.

90G tank, 70lbs live rock, up 4 months (cycled for 2). One 2.5" Blue Tang, one 3" bi-colour blennie, two 2" trocus snails, two coral banded shrimp and about 20 small crabs of some sort.

My problem is I've just gone and got a 800GPH return pump for my 10G sump (I've got larger tanks for the sump, but they're not yet baffled, etc)
and an NV200 skimmer http://www.aks.net.au/reverse_protein.html <--- not listed there, but same skimmer only smaller.

I setup the sump and ran the skimmer in it the other day for atleast 5hrs and I saw 0 skimmate, and not even enough foam to get 1/10th the way up to the collection cups top. The skimmer is designed as a complete unit, pump included so I guess it's not an issue of an under-rated pump.

The bio-load isn't huge for my tank, infact far from it. I do have nitrite/nitrate levels low in the scale, and now have an RO unit for my top-off and water changes. I did a water change 1 week before the skimmer was added.

Is this yet another skimmer I've bought that wasn't worth my $200, or does it really need a good week long run-in period before it actually starts to do it's job?

Cheers guys
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Old 06-30-2006, 02:33 AM   #2 (permalink)
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i'm not familiar with your skimmer, but most do require a break-in period. some skimmers that we have here takes up to a month to break in.
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Old 06-30-2006, 03:07 AM   #3 (permalink)
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I have to agree that it may need more time. I just moved my remora to the sump on Sunday. It just started to produce skimmate today.
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Old 06-30-2006, 03:11 AM   #4 (permalink)
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Well its a venturi system all right, air getting sucked in & through the properler housing. Uve already fired it up> Is it noisey enough to keep you awake? lol

These units create a vortex within the chamber that does take some time to get in a rythum, looking at it logicly the smaller the bubbles with the least amount of turbulance will produce the most effecient mean to skim. But breaking in down abit more technical could help (ha-go figure) if u think of a water molecule as a magnetic ball-bearing it might help mentally

As the bubble travels up through the water column, the elecrically charged protein molecules (which contain elecrically polar and electrically nonpolar regions) are attracted to the air/water interface of the bubble. The polar regions of the molecule (made up of nitrogens, oxygens, etc) are attracted to the air/water interface and these polar "tails" stick out away from the air bubble into the water column. The nonpolar regions stick out into the air bubble because it does not "like" to be in contact with the polar solvent (i.e. water).

>>>>>>(ok, take a breather)

If you could look at this bubble under high enough magnification down to the molecular level, the entire air bubble would look like a fuzzy ball with protein tails and other electrically charged tails sticking out from the surface of the air bubble. The polar regions outside of the air bubble stabilize the air bubble very much like a soap bubble in your kitchen sink or your washing machine. This is why a foam begins to build up at the surface of the skimmer. As the protein laden bubble reaches the top of the protein skimmer, the proteins begin to accumulate which creates a stable foam bubble. These stable foam bubbles take a long time to pop. Thus, the proteins slowly are concentrated at the top of the skimmer where they are slowly pushed through the "throat" of the protein skimmer and into the collection cup.

>>>>>>(ok breather #2)

The next most important factor to keep in mind is minimizing turbulence of the air bubbles inside the skimmer! The reason for this is because of the different types of dissolved organics in the water column. Different organics are attracted to the surface of the air bubbles to a different degree depending upon the molecular composition of the dissolved compound. Some compounds are highly attracted to the air bubble. Others are only weakly attracted. If the air/water is turbulent inside the skimmer, the strongly attracted compounds will stay attached to the air bubble but the weakly attracted compounds will not and they will not be skimmed out of the water column. By minimizing the turbulence inside the skimmer, both the strongly and weakly attracted compounds stay attached to the air bubble and are skimmed out of the water column. What you want to see is a nice blooming flow of air bubbles upward in the water column. If you see excessive turbulence inside of the skimmer then the skimmer is not tuned properly.
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Old 06-30-2006, 04:19 AM   #5 (permalink)
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Thanks for the answers guys. Very informative on the low downs of skimming too, veriann. I understand all of what's posted above, yet I'm still at a small (and non-important) loss as to the reason it needs a run in period, but as I said, that doesn't matter at all in reguards to my question. Can find that out for myself.

It's loud, yes, but that's only the vibration of the whole plastic unit (and small crappy pump) on the floor of my sump, and in turn my whole pine tank stand. I'm quite happy I can fix that noise though. Some stands of some sort on the bottom, suction cups perhaps, and a baffle of sorts for the air intake tube for the pump. Wouldn't a downdraft skimmer smashing bioballs with high velocity water be louder ?

I'll leave it running for a week and see where I get, it was the most expensive, reasonable looking and reviewed, protien skimmer I could afford that was rated over my tank size for the moment.

I'll glue up the pipes I've plumbed for my sump and give it another shot for a week or so.

Cheers
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Old 06-30-2006, 04:32 AM   #6 (permalink)
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try a filter pad between your unit and the bottom of your sump to help absorb some vibrations.
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Old 06-30-2006, 05:04 AM   #7 (permalink)
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In venturi, its the mixtures hitting the inside of the vortex chamber in random centrifigal patterns >>.this creates the inital turbulance. Where once there was nothing, now there is a cyclone! within three days u will have the unit running at peak with some fine adjustments.

i have only seen one coral rubble skimmer that raw SW is gravity dropped from a height to create the bubbles, its loud i guess, but natral, more waterfall sounding, & pumps harmonic frequencey sucks big time...........no buddest monk plays that tune thats for sure, 2nd only to that same monk in a strip joint!
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Old 06-30-2006, 08:12 AM   #8 (permalink)
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Thadius> ur a techi sort of bloke, try tracking down this book:
P.R. Escobal's
Aquatic Systems Engineering: Devices and How They Function

should keep u busy for the next 10years at least
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Old 06-30-2006, 08:31 AM   #9 (permalink)
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haha, cheers veriann, shall do
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