I recently upgraded to a 55 gallon tank and I would really like to add a Tiger Datnoid. In the tank already I have a 7 inch silver arowana (please save the "you need to get a bigger tank" comments...I already know and I plan to), a 3 inch black ghost knife, and a 3 inch pleco. I have a pretty bare tank with only two hiding places already taken by the pleco and ghost knife....no plants. I understand that Datnoids usually like to hide, but is it entirely uncommon to find them being comfortable swimming in open water all the time?