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I'd avoid putting penguins in a tank with a betta. I understand that they are one of the nippier tetras. Frankly I wouldn't put any other fish with a male betta in a tank smaller than 5 gallons. In a 5 to 15 gallon tank, I would stay away from any fish that share the middle water with the betta. Stick to dwarf cories and ottos, maybe kuhlis or moth catfish. At 20 gallons and up, then you could start thinking about some of the smaller, more sedate schooling fish - neons, green neons, black neons, glow-lites, cardinals, harlequin rasboras, cherry barbs. That sort of critter. Be really careful of fish with long fins and fish with any nippiness in their reputation (or at very least keep a bail out solution for the betta - a 2.5 for instance - and keep a very close eye on the tank for a month.)
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