i think the biggest i have seen is 9" and he ate roseys. they tend to just hang out at the top and im ure they wouldnt need that big of a tank cause their not that active, but may want a second opinion
they are not aggressive to the point where they go after fish and terrorize them but they do eat smaller fish
what tank were yo thinkin about puttin him in
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12g SW: 1 false-perc
29g: 15 panda corys, 2 black skirt tetras, 2 otos, 1 swordtail, 5 platys
58g SW: yellow watchman goby, 6-line wrasse, 3 firefish gobys, scopas tang
75g: 21 kuhliis, 10 discus, angel, BGK, 2 otos, 4 BNs, 2 platies
plus 3 cats, a dog, and 2 baby bunnehs
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