02-27-2014, 08:20 PM
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Because three-spot gourami's require more space to swim and have territory or they get stressed out and depressed. They also CAN reach larger sizes, so it's not a good idea, always take in the max size as consideration. Besides, keeping even a four inch one in a ten gallon would be pure cruelty. I have one who is four inches, another is five inches...the four inch one, have you seen them as adults in real life, not on photos or videos? They're not small, they're fairly thick! If you see one, you will see why it's bad to keep them in smaller tanks. They -need- space to swim right, they're not like male bettas who more often than not will hold still and be slow...(though yes, some are quite active). You don't want to keep them in anything smaller than 25 gallons, and that's for a single little loner. In a ten gallon he or she would swim a couple inches then have to turn around, not a pleasant life for an active fish.