About 10 seconds in: "Here (Heros) are found in a branch tangle in the deeper, faster water in the creek itself." The notion that Heros are restricted to slow water is incorrect.
We need to get off certain stereotypes for fish habitat, the truth is many of the widely distributed types can be found in variable biotopes, which is why they've been successful in the hobby for many decades. Another truth is some of the fish we might keep as one or two (example: severums), or even six in a tank (examples: geos, angelfish, discus), travel in much larger groups in the wild.
The geophagus sveni seems to be doing really well almost 2 weeks in. It's currently being kept with 1 heros sp, 1 rineloricaria parvae(I think), 1 pseudopimelodus bufonius, and 1 banjo catfish in the 36g growout. The severum and the geophagus sveni seem to enjoy each other's company and hang out around eachother.
I got a sveni a few weeks ago. About 3" now. He is a fireball. Chases the congo tetras like a dog chasing birds at the park. He is all over eating all the time. Rushes to my hand at feeding time. Great fish.
3 weeks in and the geophagus sveni seems to be almost fully healed, he/she is not very picky and eats anything that drops to the bottom of the tank. The severum and the geophagus sveni have been getting along very well together,I often see the geophagus sveni following the severum around almost like the severums right-hand man.