What is the key to this tank?

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Quo Vadis

Gambusia
MFK Member
Apr 12, 2014
912
21
18
Wisconsin
[video=youtube;4qkNME430UU]https://www.youtube.com/watch?v=4qkNME430UU[/video]

This person has a bunch of videos on YouTube of this tank, from over a several year period, and all the fish look very fat and healthy, so that tank seems to be successful, which is unusual in YouTube videos of Mormyrids. In one of the videos it notes that the tank is only 4ft, though from the looks of it it may be 4'x2' or perhaps a 90g? So what do you think is the key to the success of this tank, if you had to guess? Is it just that there are so many none has a chance to get bullied? I tried doing a group of ENs, and started out with 9 and ended up with 2. They were fine together for several months til I lost a couple to parasites and from then on the lowest on the totem pole kept getting skinnier and skinnier from being chased by the stronger ones til it died, down the line til I only had two left. I didn't get more because I heard they need 20g each, but this videos seems to indicate that is not necessarily true. I'm also curious how often the tank get fed...
 
I think the numbers and a place to retreat and hide. So many tubes! That and there is a pump toward the right when feeding begins mimicking current. Also there's a big filter under the pipes so I'm sure his water has to be pristine.


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