I'd just hate to see an 8' long tank going to Orange head Geos lol. The bigger fish tend to hold more personality. What about getting a Big Pair or Mota's or Trimac's, Even some pikes. Dovi and Umbee are going to be a tank exclusive setup. Some of the other species in a 350 you could try your luck at other co existing, just given the space you have.
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