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Re: NFC: Re: Filterless Aquariums.
Here's something I've been wondering for awhile and Charlie's
response made me think of it again.
How much (on the average) does gravel, plants, etc etc. displace
the amount of water in a tank?
Like if you have a 55 gal----is 90% of it is truly water(on the average)?
Has anyone else ever thought about this?
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