03-24-2010, 12:27 PM
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Originally Posted by d0r0g0
I have a goldfish that I keep alone, but she seems quite happy (don't really have room for a tank mate). It's just a common goldfish (actually was sold as a 'feeder' fish). <-- I've got pics of her in my aquariums page <--
You'd probably be able to keep 2 in a 15 gallon (commons get about 6-8") without much trouble.
Multiply 6-8" by two. The only way a comet would max out is through skeletal stunting, which will shorten their lifespan considerably. In proper conditions comets usually live from 20-40 years.
Trust me, I have seen two comets kept in a 15g surrendered to a pet store. The owners finally got fed up because the tank stank so badly and both fish were about 8" long. By the time I saw them at the store their fins had rotted and their scales were falling off. They only survived for another 2 days after that.
Therefore the minimum recommended size is about 80g per comet, and as with all goldfish they require twice the filtration in gallons per hour that tropical fish require.