Short Answer
- Acropora, Montipora, Pocillopora, Stylophora, and Seriatopora can look similar as small frags.
- Acropora often depends on axial and radial corallite evidence.
- Montipora often depends on growth form and small surface corallites.
- Do not force species-level SPS ID from one blue frag photo.
Why SPS lookalikes are difficult
Mature SPS colonies show growth form clearly. Frags often do not. A one-inch branch can hide whether the colony would become a table, bush, birdsnest, digitata, or encrusting sheet.
The best evidence comes from corallites and growth pattern, not from color names like green, rainbow, or ultra.
Common SPS lookalike clues
| Candidate | Useful clue | Common confusion |
|---|---|---|
| Acropora | Axial corallite and radial corallites. | Small branches confused with other SPS. |
| Montipora | Plating, encrusting, or smoother branching growth. | Branching forms confused with Acropora. |
| Pocillopora/Stylophora | Clustered branch tips and dense polyp texture. | Sold loosely as generic SPS. |
| Seriatopora | Fine birdsnest-like branches. | Confused with other thin branching SPS. |
Photo checks for SPS ID
- Photograph branch tips and side structure.
- Use reduced-blue lighting to reveal corallites.
- Show the base and growth edge if the coral is encrusting.
- Include frag size and age if known.
- Recheck after 4-8 weeks of growth if the first ID is uncertain.
Why a 4-8 week growth window helps
Many SPS mistakes come from naming a frag before it has shown direction. A short growth window can reveal whether the coral wants to table, bush, plate, branch finely, or encrust first.
- Photograph the same angle every 2 weeks.
- Watch new tips, base encrusting, and branch spacing.
- Keep the label broad until new growth supports a narrower ID.
Try Coral Identifier on your own tank photos
Capture a clear photo, review likely matches, and build better coral ID confidence over time.
Identify on the App StoreSources
References and further reading
FAQ
Frequently asked questions
01Why are SPS corals hard to identify?+
Small SPS frags often lack mature growth form, and blue photos can hide corallite details that distinguish genera.
02How do I tell Acropora from Montipora?+
Look for Acropora-style axial and radial corallites versus Montipora growth forms such as plating, encrusting, or smoother branching.
03Can AI identify SPS coral species?+
AI may suggest likely groups, but species-level SPS ID from one frag photo is usually low confidence.
04What is the best SPS ID photo?+
A reduced-blue side-angle photo showing branch tips, corallites, base, and growth edge.