Related Clues:

• Four prefix
• "Four" prefix
• Colorful tank addition
• Prefix with -hydrozoline
• Guppy's tankmate, perhaps
• This swimmer fighting with cops could be spectator
• Colorful tank denizen
• Heartless teenager in meal featuring tropical fish
• Prefix for four
• A brightly coloured tropical freshwater fish
• Do more than just tri?
• 'Neon' fish in a tank
• Fore four?
• Prefix between tri- and penta-
• Colorful aquarium denizen