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How many fish can I put in a 20 gal. Tank? I have 3 blue guramis that are about 2.60 inches

i have an aquateck 20-40 filter and my tank dimensions are 24" wide 12" deep and 16" tall the blur gauramies have not grow in over a year and choose to stay hidden. i have three and want a fish to look at for my grand daughter. any suggestions on type and qty. i can add?? thanks!!!

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4 or 5. Some have to be small, and the others have to be larger. They must not eat each other, and they have to have enough room to get enough oxygen, or else they'll resort to fighting each other. A fish that she'd probably like is a glo-fish. They're about medium size and they glow in the dark. They love to be out in the open with other fish and they don't like light.

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