11-06-2008, 06:36 PM
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Due respect, Heiko, but while I appreciate that fish are more comfortable in their native biotope, no aquarium, not even one of your really huge and gorgeous ones, is the same as leaving the fish in the river (or lake or pond or ocean) from whence it came. So a certain level of unnatural condition is a baseline. While I would agree with you wholeheartedly insofar as it is a bad idea to put together fish from diverse habitats with divergent water profiles, I see no reason beyond a certain aesthetic not to include fish from multiple regions in a single aquarium, so long as they prefer substantially similar water quality and won't aggressively go after each other.
In the case of Violet and Bumblebee gobies, the only concern would be the size of the violet goby's mouth. However, as it is a sand sifter with a small throat, there is a significant body of advice to be found that suggests that they would be compatible tank mates, even thriving together.