I disagree ... sometimes a small tank can hurt, but it can also leave no room for fish to form a territory .... its impossible to defend a territory if while you chase 1 off 3 others come in ... its been shown that confined space with lots of fish can actually help aggression, but wont help water quality ... who knows which will happen until you try I guess ... I started with a 40 gallon breeder, and didnt see aggression until they went into the 220 .... whether 5 fish is enough to reduce aggression in payara, or at least reduce the chance of them ganging up on 1, I dont know ... I have never noticed my vampires get so aggressive toward eachother, or anyone else, that they cause serious harm ... just nudge out of the way ... others have had more brutal stories, so it comes down to try it, watch closely, and if things get ugly have a back up plan set
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Didn't work quite as well for me. I had a pile of bichirs and a wolffish in a smaller tank and all my wolf did was chase my bichirs around. i guess it varies from fish and personality.