Yellow Assessor tank mates
Assessor flavissimus
5 rated pairings from the Yellow Assessor care guide. Compatibility here means water, temperament, tank zone and adult size all line up — the note on each card says why. Yellow Assessor needs at least 20 gallons on its own; every companion adds to that.
Excellent matches
2 · Same water, complementary zones, no conflict.Ocellaris Clownfish
Amphiprion ocellaris
20 gal min · 3.5" adult · Semi-aggressive
Similar peaceful temperament and reef-safe; occupies different water column zones
Cleaner Shrimp
Lysmata amboinensis
30 gal min · 2.5" adult · Peaceful
Non-aggressive; provides cleaning services without competing for food or space
Good matches
2 · Compatible with normal care — watch space and numbers.Pistol Shrimp
Alpheus randalli
20 gal min · 2" adult · Semi-aggressive
Peaceful invertebrate; may interact with assessor but generally compatible in larger tanks
Neon Goby
Elacatinus oceanops
20 gal min · 2" adult · Peaceful
Small, peaceful fish with similar reef-safe requirements and non-aggressive behavior
Use caution
1 · Works in the right setup; read the note before combining.Planning this tank?
Run the whole stock list through the calculator — it checks bioload and schooling numbers, not just pairings.