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 Post subject: Jack's System
PostPosted: Aug 8th, '11, 18:02 
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Hi Everyone

I've had a keen interest in aquaponics since my brother planted the seed about a year ago and now I am ready to start putting a system together and would obviously love some feedback and advice from forum members.

I am trying to do it as cheaply as possible and now that I have my fish tank and grow bed (pic below) I am able to move forward on it quite quickly. I've calculated the fish tank to be around 600L with a 450mm depth and the growbed to be around 300L with a 250mm depth.
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I've just purchased a 1350L/h pump on ebay and plan on purchasing a 1800/h air pump when the fish get bigger but I don't think it will be necessary at the start.

I am going to set up a flood and drain system and am hoping someone can point me towards a diagram of the components required to put a flood and drain plug together. I know I can buy it already made up however as I already have pipe laying around the house I'd like to see if I can rig one up myself.

Anywho, watch this space and I'll keep the updates coming and welcome any advice, critiques and of course praise for my newby system.

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 Post subject: Re: Jack's System
PostPosted: Aug 8th, '11, 22:25 
Welcome Jack... see if you can get another grow bed to balance out the filtration to fish tank...


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 Post subject: Re: Jack's System
PostPosted: Aug 9th, '11, 08:13 
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G'day Jack.... click on "Board Index" top left corner, then "Aquaponic discussions" and read down the list, heaps of setups explained there....... cheers.


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 Post subject: Re: Jack's System
PostPosted: Aug 9th, '11, 13:47 
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RupertofOZ wrote:
Welcome Jack... see if you can get another grow bed to balance out the filtration to fish tank...

Thanks for the info Rupert however I am still not up with the AP terminology. Do you mind explaining what you mean by balance out the filtration?
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 Post subject: Re: Jack's System
PostPosted: Aug 9th, '11, 13:54 
Jack, you really need a minimum of a 1:1 ratio between fish tank volume to grow bed volume... to ensure that you've got adequate filtration and oxygenation.... preferably >> 2:1...

But you can have less... as long as you stock to your grow bed filtration capacity... rather than your fish tank volume...

Of course more grow bed area... also means more plant growing area... :wink:


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 Post subject: Re: Jack's System
PostPosted: Aug 9th, '11, 14:20 
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Cheers, my research had led me to designing a 2:1 (fish tank:growbed) system. Rather than doubling the filtration would the reverse work for halving the fish population and including an air pump? I got a quote for silver perch at $4.95 each so I only plan on buying about 20 or so to start with.

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 Post subject: Re: Jack's System
PostPosted: Aug 9th, '11, 14:33 
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I would say that 300 litres of filtration would be good for about 10 - 12 fish.

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 Post subject: Re: Jack's System
PostPosted: Aug 9th, '11, 14:41 
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Thanks guys, your brains and expertise are worth gold... well not really as gold was $1700/oz today :)

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 Post subject: Re: Jack's System
PostPosted: Aug 9th, '11, 15:22 
Sorry Jack... the 2:1 ratio should be grow bed to fish tank... not the other way round....

And yep, with only 300L of filtration.. 10-15 fish would be about the max...

$5 per fish is pretty expensive... how big are they??


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 Post subject: Jack's System
PostPosted: Aug 9th, '11, 15:40 
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Cheers. I think I'll start with less fish and expand the system as I gain confidence (less chance of a diabolical screw up).

The Silver Perch were 5cm for $3.95 or 7cm for $4.95 from The Pond Shop. A lot more than I was hoping to pay but I have time to look around before I am ready to introduce fish

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 Post subject: Re: Jack's System
PostPosted: Aug 9th, '11, 15:43 
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RupertofOZ wrote:
Jack, you really need a minimum of a 1:1 ratio between fish tank volume to grow bed volume... to ensure that you've got adequate filtration and oxygenation.... preferably >> 2:1...



Why...?


Damn I hate these ratios that always some up. Aren't you far better off having a ratio more along the lines of what he has, that way you have more water volume with less fish in there, so less likely to have problems, much better buffer in the system.

I'd say stick with what you have Jack..

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 Post subject: Re: Jack's System
PostPosted: Aug 9th, '11, 15:46 
True... as long as the fish are stocked to the available filtration capacity.. no problems...

Having twice as much grow bed/filtration can't be a bad thing though... and lets you grow more veges...

It doesn't mean that you have to stock more fish...

The main point was... don't stock the fish to the fish tank volume... stock to the grow bed volume...


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 Post subject: Re: Jack's System
PostPosted: Aug 9th, '11, 15:48 
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I think the only ratio worth worrying about is fish to filtration.

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 Post subject: Re: Jack's System
PostPosted: Aug 9th, '11, 15:54 
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Thats kind of my point... No one should ever be stocking to a tank volume... BUT, the bigger the tank volume the better, especially for people starting out..

With our systems, I would rather see people starting with a single bed system rather than with 2 beds on a 1000L tank.. 20-25 fish in 1000L with a 500L bed, cool, no problems. 40-50 fish in 1000L with 2 x 500L beds, is a 1:1 ratio, but more chance of things going wrong with all those extra fish...

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 Post subject: Re: Jack's System
PostPosted: Aug 9th, '11, 15:57 
True, true Joel... Likewise, I'd only advise the extra grow bed on a 1000L tank....for the purpose of more veges...

If they wanted more fish... then I'd suggest a 2000L tank, and extra grow bed... :wink:


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