Tropical Fish Keeping - Aquarium fish care and resources

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-   -   Water changes and aquarium size. (http://www.tropicalfishkeeping.com/freshwater-tropical-fish/water-changes-aquarium-size-106365/)

neonk 07-06-2012 12:34 AM

Water changes and aquarium size.
 
I ran a 10 gallon tank succesfully for years on 20% water changes monthly. I only had small fish (neon tetras) and an aquarium crab though. So generally speaking in a tank half the size with similar stocking should the water changes be increased? How does this work?:shock:

Sanguinefox 07-06-2012 12:39 AM

Quote:

Originally Posted by neonk (Post 1143104)
I ran a 10 gallon tank succesfully for years on 20% water changes monthly. I only had small fish (neon tetras) and an aquarium crab though. So generally speaking in a tank half the size with similar stocking should the water changes be increased? How does this work?:shock:

Sounds strange doesn't it? The way it works though is quite simple. Larger tanks have more stable environments. Smaller tanks don't. Though that's not quite the case here.

If you have lets say X fish in 10 gallon they are putting out (insert amount of waste) into ten gallons of water.

Now imagine you take the same X fish and put them in a five gallon. Now they are still putting out (insert amount of waste). Your water is now taking in across five gallons what used to go into 10 gallons. The water gets more dirty faster. Thus you have to do water changes more often (or potentially more water per water change). Smaller tanks reach their limit's water wise faster than bigger ones. It's why smaller tanks are actually often more difficult to keep going versus larger ones.

Tazman 07-06-2012 12:41 AM

fish also give off chemicals to attract potential mates and deter predators, these are also removed in water changes.

neonk 07-06-2012 12:43 AM

I forgot to add that the ratio of fish to water will be the same, so I will have half the amount of fish as I did in the 10 gallon. Will the 5 gallon still require more water changes just because it is smaller?

Sanguinefox 07-06-2012 12:45 AM

Quote:

Originally Posted by neonk (Post 1143117)
I forgot to add that the ratio of fish to water will be the same, so I will have half the amount of fish as I did in the 10 gallon. Will the 5 gallon still require more water changes just because it is smaller?

What fish are you planning to put in there? A five gallon really doesn't hold much to begin with.

neonk 07-06-2012 12:46 AM

Either a couple of neons or some catfish

Sanguinefox 07-06-2012 12:47 AM

Quote:

Originally Posted by neonk (Post 1143124)
Either a couple of neons or some catfish

Cat fish? What specific species?

Tazman 07-06-2012 12:48 AM

None in a 5g tank...

neonk 07-06-2012 12:48 AM

Smaller ones like corys

Tazman 07-06-2012 12:51 AM

Tank is too small for any catfish..sorry.


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