5lb or 10lb tank for 90 gallon? - The Planted Tank Forum
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post #1 of 17 (permalink) Old 10-28-2006, 04:00 PM Thread Starter
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5lb or 10lb tank for 90 gallon?

I'm ordering a co2 setup today how long will these bottles last for a 90 gallon tank? should I spend the extra to avoid filling it more often? please weigh in on how long yours lasts for larger tanks.

thanks

90 gallon planted rainbow fish/ community tank, pressurized C02, 2.8 wpg cf, eco-complete,

1-20 gallon breeding/growout
2-15 gallon breeding/growout
4-10 gallon breeding/growout

currently breeding hi fin red eye swordtails, kribensis, orange platys, trying others
DIY central sump filter w/auto water changing and auto water top off, DIY in-line co2 reactor.
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post #2 of 17 (permalink) Old 10-28-2006, 05:35 PM
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I would order at least a 10 # .
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post #3 of 17 (permalink) Old 10-28-2006, 06:00 PM
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Get the biggest tank you can fit under your stand. If it isn't going under the stand, get a 20#.
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post #4 of 17 (permalink) Old 10-28-2006, 06:20 PM
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Quote:
Originally Posted by yoink View Post
Get the biggest tank you can fit under your stand. If it isn't going under the stand, get a 20#.
Especially for a tank that size, I'd get at least a 10# tank...but the biggest that can fit is the best choice.
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post #5 of 17 (permalink) Old 10-28-2006, 06:22 PM
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The price difference for a fillup for a 5lb vs a 10lb is nominal, at least at the place I got mine filled. It's as if there's a flat rate, and the cost of CO2 per pound is quite low. My input would be a 10lb or higher.
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post #6 of 17 (permalink) Old 10-28-2006, 07:48 PM
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10# or larger.

Eric


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post #7 of 17 (permalink) Old 10-28-2006, 09:25 PM
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For some numbers to chew on:
I used a 29 gallon tank up until a month or so ago. I use a 5 pound tank of CO2. That CO2 lasted 10 months, running about 3-4 bubbles per second measured at the bubble counter. A 90 gallon tank would use about 3X as much CO2, so it should last about 3+ months. You can't go wrong getting at least a 10 pound tank.

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post #8 of 17 (permalink) Old 10-28-2006, 09:36 PM
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Aluminum 20 lb. is nice, but won't fit under most stands, unless its a custom stand.





Three Tanks...Eheim 2128 & XP3-90G, Eheim 2128-65G, Eheim 2232-25G.... Tek 4x54 watt T5-90G, Aqualight 96watt PC 65G low tech, 65 watt Aqualight-25G.... Hydors-90G & 65G ... Flourite in 90, 65, & 25 Gallons, .... Auto Water Change/Auto dosing on 90 & 65 gallon..... AGA member......
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post #9 of 17 (permalink) Old 10-29-2006, 12:55 AM
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I have a 90 gallon with a 10# cylinder. At, more or less 3bps, I get approx 4 months out of a tank. That's roughly $30/year of CO2. Not bad, IMO.
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post #10 of 17 (permalink) Old 10-29-2006, 03:23 AM
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I have a 20# tank on my 90, it lasts almost a year! If had my co2 in a remote location (not under the stand) I would get a larger one, my time is valuable and it takes about 2 hours to go and get a new one.
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post #11 of 17 (permalink) Old 10-29-2006, 03:37 AM
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I have a 15# for two 10 gallons and a 7 gallon cube. =P
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post #12 of 17 (permalink) Old 10-30-2006, 03:59 AM
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20#=Heavy! But swappable with most co2 refill location, cheaper to refill by amount.
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post #13 of 17 (permalink) Old 10-30-2006, 04:43 AM
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When I was at the local welding supply store it was only like $5 more to get a 15# tank rather than 10#, and like $10 more than a 5#. Well worth a couple more bucks to get the larger tank.

15# tank going for a year now on a 75G on first fill.
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post #14 of 17 (permalink) Old 10-30-2006, 06:22 AM
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Since my tank sits on my dresser, I got a 20#!! Though my tank's only an 18gal! XD
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post #15 of 17 (permalink) Old 10-30-2006, 07:26 PM
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Quote:
Originally Posted by Steven_Chong View Post
Since my tank sits on my dresser, I got a 20#!! Though my tank's only an 18gal! XD
I bet that will last FOREVER
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