I had my Schoutedeni in with congos and redeyes also in a 75. It was the exact opposite the tetras would take the puffers snails to the far side of the tank and were constantly ziping around. While the puffer was healthy he/she was obviously unhappy. My puffer is currently in a 65 with a group of 8 synodontis lucipinis. The synos were in the 75 also. They get along fine and the puffer is back to her/his old self.Thought I’d revive this thread. I’m interested in a Congo biotope for my t. schoutedeni . I’ve introduced 2 types of African tetra, blue diamond and red eyes. I was wondering about easy plants from that part of the world, as well as algae eaters. And yes I know the puffers might savage the other fish, though so far they show no interest. I have space to relocate any damaged fish.