Dwarf zebra lion

No, too small. That's not very much swimming room, so it would be more like a jail than anything. Even if it's by itself, it doesn't make those tank walls any further apart.
 
25 is too small even if its not a particularly mobile fish or big for that matter. If I were you ,go at least 40+ with some LR for him to perch and hang from.
 
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