so r u guys positive a sen can live happily in a 40 gal?
Yes. I have two bichers that are about 12" and have lived for years in a 40 gallon breeder
With a 6" African clawed frog and a couple African leaf fish.
If its a breeder tank like mine, with a 36x18 footprint and some hiding places, I would say you can keep 4-5 Senegal or other small lower jaw species. Maybe less in a standard 40.
If you just keep one he should be fat and happy. Although i think they do better and are more active in groups
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