I really like the tesselata, While some people will say you can keep a tessy in a 200, I would say 300 would still be on the small side. Someday when i have the $$$$ and space, I will have a tesselata for sure. Tessys don't like a whole lot of light so there are no worries about spending loads of cash on lighting for such a large tank. Lots of hiding places are required (must be very sturdy so not to fall and crush the eel or damage your tank) As for tankmates, I would keep it in a species tank without other fish (my recommendation to keep one alone is what I personally would do... i'm sure people have had success with tankmates) The one most important thing is to be sure to have a strong, weighted down, secure fitting lid. They will escape if you do not... Good filtration is a must too. I would imagine a large tessy will produce quite a bit of waste... Good luck if you decide to do set up a tank for a tesselata in the future... Does anyone out there have a tessy now? if so, I would love to hear about how it is working out...