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I have a Synodontis Alberti in my rift lake tank. I was wondering if it would be OK to add a few Syno. Multipuntatus or Petricolas. Would they get along? The tank is a 100 gallon 4 ft. tank. The Alberti keeps to himself and hides most of the time. Are the Multis or Petricolas as reclusive?

no, they're highly active and visible IF you keep them in a group of at least 5.

best do petricola's; multipunctatus is very boisterous and might disturb the albarti (wich is a rare fish!) too much.

alberti is a highly nocturnal fish (long whiskers and big eyes , BOTH ) so it's behaviour is natural.