07-06-2012, 12:39 AM
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Originally Posted by neonk
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?
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.