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PostPosted: May 4th, '17, 19:59 
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Best wishes to everyone in this forum!!!!

I am using IBC tank for fish tank and six half barrels as grow beds out of which only two GBs are active now.

I have been reading and watching videos about the fish feed and grow bed ratio and tried to follow some but honestly could not figure the right proportions.

As I would like to continue using the above setup can any help me to identify the square meter of the GB taking into account the roundness of the barrels.

Sounds stupid but still feel it is worth asking.

Thanks for your help.

Taj


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PostPosted: May 5th, '17, 22:55 
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PostPosted: May 6th, '17, 08:05 
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Quote:
I am using IBC tank for fish tank and six half barrels as grow beds out of which only two GBs are active now.....As I would like to continue using the above setup can any help me to identify the square meter of the GB taking into account the roundness of the barrels.


Presume you are talking volume (m3 - cubic metre) not square metre (m2)

If they are blue barrels then they are 200/220 Litres (if different the barrels might have it written on them)
As they are cut in half then you have roughly 100 Litres/half.
From this subtract the LxW x depth of the space without media (usually this will be 5cm or so).
1000L = 1m3 so 100L = 0.1m3 Your half barrel will probably be 80-90L/half barrel.

** most fish-media ratio stuff deals with WET media not total media.
so depends on your water depth.


If you want to check the drum volume then it will vary a bit if wider at middle and less at ends.
But basically the area circle (Pi times radius squared) x length. Then divide in 2 for the half volume.

If you want to calculate it exactly then this can get a little/lot more fiddly.
It would be much easier to simply fill an empty half drum with water to the desired level from a bucket of known volume.

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May the fish sh*t and the plants grow.....


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PostPosted: May 8th, '17, 20:43 
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So how much does a 200L drum have for a air gap on top of the contents to the underside of the top of the drum. All drums are designed with that volume of air, this allows for the contents to expand.

In the USA, that air gap is 5% of the contents or 2.75 gal's in addition to the 55 gal's of contents.

I, was surprised that your final answer for cutting a 200L drum into 2 equal halves and end up with 80-90L's per halve.

I, guess that is the same as to what is the boiling point of water?


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