Related Clues:

• Small grouse
• Objection
• Goldfish relative
• Have lots of beefs
• Be nitpicky
• Worry unnecessarily
• Izaak Walton's ''very subtil fish''
• Complain about trifles
• Minnow relative
• Gripe, gripe, gripe
• Bottom-feeding fish
• Bottom feeder
• 21-Across. e.g.
• Fault-find
• Koi