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Carib-Sea Eco-complete? And gravel amount calculations
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Joined: 06 Feb 2003
Location: Houston, Texas

PostPosted: 2003.09.16(Tue)22:40    Post subject: Reply with quote


I apologize for posting misinformation. I should have said a "general"
rule of thumb is 1 pound of gravel per gallon of water. I should have
further expanded my thought process to include really odd shaped tanks
and included a "common sense disclaimer" which I thought I did when
I said your mileage may vary.

If you look at Steve's calculation's, I wasn't far off the mark?

Steve advised the following:

>Seachem recommends 1 kg per 62 see you. in., and the Eco-Complete should
>follow the same formula. I have just added 1-20 lb. bag to a 10G new setup
>so I haven't any personal experience yet. Here is the complete formula:
>30 x 12 x (Depth of substrate) 3 = 1080 cubic inches needed
>1 bag is 9 kg, so 1 bag is equal to 558 cubic inches

Let's translate that into pounds per gallon:

9 kgs x 2.2 = 19.84 lbs x 2 = 39.68lbs, I agree with your decision
to grab the extra bag of the substrate, given 2la's input, I would
do the same. How did you come to your decision and factor in the
water displacement, he described in his post?

>30 x 12 x 3 = 1080/558 = 2

Hmmm, we are on the same page. Let's look at flourite:

>If you were using Flourite you would divide by 434
>(Flourite is 7 kg bags).

OK, let's do that:

30 x 12 x 3 = 1080/434 = 2.49

7 kgs = 15.43 lbs, lets do the math:

2.5 x 15.43 = 38.75 lbs

Is my "general" rule of thumb really wrong when "common sense"
is practiced?

Thank you for bringing this post to my attention. I will be more careful
in the future and post exact numbers.

Best regards,

William, I don't count all the grains of gravel in my tank Wink

Rotem wrote:

A note to William, The rule of tumb of 1lb per gallon, does not make any sense. Gravel/substrate should be calculated by surface are and not volume.

According to your rule a 30g breeder would need 30lb of substrate and a 65 would need 65lb....guess what, they both have the same surface area 36x18. Which means that you'll have more than double the depth of gravel in the 65g.

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Joined: 05 Feb 2003
Location: St. Paul, MN

PostPosted: 2003.09.17(Wed)0:59    Post subject: Reply with quote

I've had it for several months, and I actually prefer it to Flourite, at least aesthetically. Judging performance will require more time, but everything indicates that the plants love it. It's also easier to keep plants anchored because the spherical grains compact easily. I grew a furious lawn of Ranalisma humile (a chain-sword-like species) in no time.

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