Lovely to Look At, Nightmare to Manage
Green star polyps — bright green polyps on a purple mat, waving in the current. Beautiful at first, but GSP can encrust half a tank in months if left unchecked.
What Makes GSP So Aggressive
GSP spreads via an encrusting purple mat that grows over any hard surface — rock, glass, equipment, even other corals. In a well-fed tank with decent light, expect several centimetres per month of mat expansion.
Containment Strategies That Work
1. The Back Wall Method Place GSP on the back glass deliberately and let it cover the entire back panel, maintaining a gap to the rockwork. The result is a gorgeous living green backdrop that's easy to manage with a razor scraper.
2. Island Isolation Put GSP on a rock completely surrounded by sand. The mat can't cross open sand.
3. Frag Plug Display Keep GSP on frag plugs in a dedicated section. Swap out when overgrown.
Removal Methods
- Peeling — the purple mat can often be peeled off rockwork in sheets
- Razor scraping — quick work on glass surfaces
- Kalkwasser paste — kills the advancing front when applied with flow off
- Super glue barrier — a line of super glue gel that the mat struggles to cross
The Case For GSP
Despite the management overhead, GSP is genuinely beautiful. That vivid green against the purple mat is striking. The back wall approach gives a professional, lush look. It's incredibly hardy, provides a natural aesthetic, and helps with nutrient export.
Quick Care Notes
- Light: Low to high — adapts to basically anything
- Flow: Moderate. Strong flow makes the polyps dance
- Feeding: Not required but grows faster with broadcast feeding
Want to try GSP with a containment plan? Browse soft coral frags from UK sellers on Reefsy. A small frag is all that's needed — give it six months and there'll be plenty.
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