Comparison: Berghia Nudibranchs vs. Other Aiptasia Eaters

If you want to combat Aiptasia in your saltwater aquarium biologically, you'll encounter various animals: filefish, Chelmon rostratus (Copperband Butterflyfish), Wurdemanni shrimp, or Berghia nudibranchs. But which Aiptasia eater is truly the best choice for your reef?

Here's a direct and honest comparison:

1. Berghia Nudibranchs (Berghia stephanieae)
• Pros: 100% reef-safe. They are absolute dietary specialists and feed exclusively on Aiptasia. They are guaranteed never to touch corals (SPS, LPS, or soft corals). They find even the smallest Aiptasia in the deepest caves of the reef.
• Cons: Nocturnal and small (rarely seen). Once they've eaten all the Aiptasia, they starve as they don't accept substitute food.

2. Wurdemanni Shrimp (Lysmata wurdemanni)
• Pros: They are active, also eat leftover food, and are relatively inexpensive to purchase.
• Cons: No guarantee! Many Wurdemanni shrimp don't touch Aiptasia at all if they are fed normal fish food instead. Furthermore, some specimens are suspected of picking at LPS corals or encrusting anemones.

3. Bristletail Filefish (Acreichthys tomentosus)
• Pros: Considered a very efficient and tireless Aiptasia eater.
• Cons: Absolutely no guaranteed reef safety. As soon as the Aiptasia are gone (or even before), filefish very frequently attack LPS corals, Zoanthus, or the tentacles of tube worms. Moreover, they become too large for nano tanks.

Conclusion: Why the Berghia Nudibranch Wins
If you keep valuable corals in your aquarium, the risk with fish or shrimp is often too high. The Berghia nudibranch is the only animal that is 100% safe for your reef and tackles the problem at its root. It is the safest and cleanest biological solution in marine aquaristics.