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Old 03-02-2016, 04:59 PM   #1
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Confusion over filtration!

Hi!
I am looking to upgrade my 20L marine tank to a 100L. The problem is that this tank is the top of a stack of three so I have no room to add a sump or have any kind of filter that needs space outside the tank. I am intending to section off one corner of the tank which will hold all equipment and am planning on only having pulsing xenia, mushrooms and whatever else appears on the rock, along with one fish (will be asking questions about that later too!!)

I have been looking for advice with regards to what kind of filter and filter media I need, or, indeed, if I need any and have just been confusing myself!
I have been reading lots of things that say all I need is the live rock, sand, skimmer and powerheads for water flow, but is this ok for a 100L? Do I need any other kind of filter media?

If anyone can offer me advice or their own experiences this would be greatly appreciated! I can build, run, change and adapt freshwater filters til the proverbial dairy herd gets here but my only experience with marine has been in the last year and on a tiny scale! I don't do small tanks so have been itching to upgrade the 20L for ages - now a tank is free and I need to get it started!!
Thanks in advance!

Just realised that gallons might be more useful for most members...20L = 4.5G (5.2 US G) 100L = 22G (26.5 US G) Think those conversions are right...!
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Old 03-03-2016, 08:12 AM   #2
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http://www.aquariumadvice.com/forums...cture69870.jpg

Here's a picture of the tank if it helps - the top one is currently empty and will hopefully be the new marine upgrade.
Can anyone help with my filter questions?!
Thanks
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Old 03-03-2016, 11:43 AM   #3
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The main filtration in saltwater is the rock and sand in the tank. As long as you are feeding minimally, have proper flow, and use ro/di water, you can easily get away with using HOB equipment to filter your tank. For a HOB filter I would want to use one rated much higher than the tank, but in terms of filter media it always ends up varying on what is going on in the tank itself...won't know that until the system is running and maturing.
You may also want to consider a skimmer. Though you can get away without one, as small systems can easily be managed with water changes to address issues, they are always beneficial as they remove waste from the water column before it can break down in the nitrate cycle.
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Old 03-03-2016, 12:18 PM   #4
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Thanks for your reply, very helpful, but I may have some more questions...!

Is HOB Hang On Back? It's not something I'm familiar with, and I don't think I would have the space, due to the tank being against the wall.

I was planning on siliconing perspex at one end or corner of the tank to create a space where I can place powerhead, heater etc - would this work in place of HOB? I would probably also do a smaller one at the other end to enable two powerheads to be used.

Do you think I would be better to set up the tank with live rock and sand, get the powerheads working and then see what else I needed?

In my small marine I currently have a mini external - not the best for marine I know - but this has been working really well so far (tank has been running for just under a year) with just the standard ceramic noodles and filter sponge. This was before I really started to look into it properly so with an upgrade just want to make sure I get it right!

Am I right in thinking a protein skimmer needs to be outside the tank - or at least part of it - as well?

Sorry for all the questions!
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Old 03-03-2016, 09:16 PM   #5
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Yes, hob stands for hang on back.
I don't see where a small place is going to replace physical filtration. It would be just like the skimmer, as it would hang off the back of the tank.


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Old 03-03-2016, 09:31 PM   #6
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Anyway the setup can be moved out a little from the wall?You would only need a few inches to be able to use hob equipment .


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Old 03-04-2016, 08:42 AM   #7
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To be fair there is no reason why the tanks can't be moved, it just means draining the other two tanks down to do it, which I was trying to avoid to be honest!!

So I could do powerhead at one end and an HOB at the other and this would provide me with filtration and enough flow? Would an HOB do a similar job to a skimmer if positioned correctly or, as it is not a big tank, would the work that a skimmer do not be so important?
Thanks!
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Old 03-04-2016, 10:17 AM   #8
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Confusion over filtration!

HOB filter on one end and a power head on the other would be fine,but ideally you also need at least one and a half lbs. of live rock per gallon.
On that size tank if you do a partial water change weekly you would not need a skimmer.

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Old 03-04-2016, 11:27 AM   #9
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Thats brilliant, thankyou so much for your help!
If my maths is right then im looking at about 37lb of live rock which I think is about 16kg. This could take some saving up!!
Thanks for your time and help on this.
I know it will be a long while til im ready for any livestock but what kind of single fish could I keep in this size tank? I just want one specimen fish and really like fuzzy dwarf lionfish but would this size be too small for one? If so, what alternatives would there be?
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Old 03-04-2016, 11:53 AM   #10
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Id say 26g is to small for a dwarf lion imo. But if your looking for one interesting fish an angler would work, and are some of the coolest looking creatures on the planet. The striated and wartskin are my 2 favorites.

You also don't need 1.5 lbs of rock per gal, 1lb is fine. And a skimmer isn't necessary on this size tank. And no a hob filter doesn't do the same job as a skimmer, but because larger percentage wcs are easier on nano tanks they aren't really necessary. 25% weekly will keep you right where you want your params and it's only 6 gallons or so


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