05-13-2008, 09:30 PM
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As they are brackish fish, the exact salinity of the water shouldn't be crucial, as they have evolved to tolerate varying levels. I'd say the most important thing when it comes to salt, is not doing anything too quickly, and giving them time to adapt.
I've heard that if they are only kept in small groups the largest one will bully the others. Supposedly if you keep more than one, it's best to keep a larger group. The 55 may be sufficient for these guys for a while, but you should be prepared to rehome one or more of them if necessary. A 55 long would definitely be preferable. The larger the surface area, the better, as they are bottom dwellers. I'd worry more about bottom space than the actual gallons.
Sand is definitely a good idea since they will enjoy burrowing in it. They will cut themselves on sharp rocks and gravel. Light colored substrate will bleach them out more, whereas darker substrate will bring out their colors.