Why is my Blastomussa wellsi not opening fully?

It could be receiving too much light or water flow, which causes the polyps to retract to protect their delicate tissue. Check your water parameters, particularly alkalinity, and consider moving it to a more shaded, lower-flow area.

How often should I feed my Blastomussa?

Target feeding once or twice a week with mysis shrimp, brine shrimp, or LPS pellets is ideal. Turn off the flow briefly to let the coral cleanly capture the food with its tentacles.

Can I place Blastomussa next to other corals?

Yes, it is very peaceful and lacks aggressive sweeper tentacles. However, you must still leave enough space for its large polyps to expand fully, and ensure neighbouring aggressive corals do not sting it.

What is the difference between Blastomussa wellsi and Blastomussa merleti?

B. wellsi has much larger, fleshier polyps (up to 10cm across) that grow closely together, often hiding the skeleton. B. merleti has smaller polyps (around 2-3cm) with more distinct, visible branching tubes and space between them.

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Blastomussa Wellsi

Blastomussa wellsi

A stunning, large-polyp stony (LPS) coral prized for its fleshy, brilliantly coloured polyps and peaceful nature.

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Ideal Conditions

Temperature: 23 – 26 °C
pH range: 8.1 – 8.4
Hardness: 8 – 12 dGH
Salinity: 1.024 – 1.026 SG
Adult size: 10 – 30 cm
Nano reef suitable: 50 litres+
Lifespan: 10 – 50 years
Diet: Photosynthetic and zooplankton feeder
Water flow: low to moderate
Preferred setup: Established reef aquarium with stable alkalinity and calcium

About the Blastomussa Wellsi

Blastomussa wellsi is a highly sought-after LPS coral that features exceptionally large, fleshy polyps compared to its cousin, B. merleti. Its vibrant colourations—often contrasting rings of red, green, purple, or cyan—make it a standout piece in the lower levels of a reef aquarium. It is naturally found in deeper or shaded reef environments, making it relatively undemanding regarding light intensity and an excellent choice for a variety of reef setups.

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Is it right for your tank?

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Where Blastomussa Wellsi comes from

Native range

Indo-Pacific, Red Sea, Coral Triangle

Countries / regions

Australia, Indonesia, Philippines

Habitat

Lower reef slopes, shaded overhangs, and slightly turbid waters with gentle flow

Commonly found in deeper or shaded reef zones away from intense tropical sunlight.

Similar species

Blastomussa merleti
Blastomussa merleti
Acanthastrea lordhowensis
Micromussa lordhowensis
Candy Cane Coral
Caulastraea furcata

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

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Ocellaris Clownfish
Amphiprion ocellaris
Peaceful fish that will not nip at the fleshy polyps of the coral.
Great
Skunk Cleaner Shrimp
Lysmata amboinensis
A superb scavenger that will leave the coral tissue completely unharmed.
Great
Coral Beauty Angelfish
Centropyge bispinosa
Dwarf angelfish have a reputation for occasionally nipping at fleshy large-polyp stony corals.
Compatible with caution
Raccoon Butterflyfish
Chaetodon lunula
Corallivorous species that will actively consume the fleshy polyps.
Not recommended
Emerald Crab
Mithraculus sculptus
While often used for algae control, hungry individuals may pinch and tear the delicate flesh of the Blastomussa.
Not recommended

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