Tail Spot Blenny Care Guide: Ecsenius Stigmatura Reef Safe
Walk past a healthy nano reef and one fish always seems to be perched halfway up a rock watching you. The tail spot blenny (Ecsenius stigmatura) is a 6 cm peaceful algae grazer with a tan body, blue eye ring and a black spot at the base of the tail — and it is one of the most beginner-friendly reef fish in the hobby. This guide from Gensou Aquascaping at 5 Everton Park covers diet, perch behaviour and the small but real risks of clam-mantle nipping.
Identification
Ecsenius stigmatura shows a tan to olive body with a yellowish facial wash, an electric blue eye ring and the characteristic black spot at the caudal peduncle. The closely related lawnmower blenny (Salarias fasciatus) is significantly larger at 12-13 cm and has a more elaborate head crown. Buyers sometimes get the two confused at SGD 30 and SGD 80 price points respectively.
Adult Size and Tank Minimum
Tail spot blennies stay at 6-7 cm and thrive in tanks as small as 60 litres. They are ideal nano fish that punch above their size class with bold personality. A single specimen per tank under 200 litres — they are territorial with their own kind. They do not bury in sand and require multiple rocky perches at different heights for territorial display.
Diet and Algae Reliance
Primarily herbivorous. They graze film algae, diatoms and short turf algae from rockwork all day long. In a tank with no algae growth, they need supplementation — clip nori or marine algae sheets two to three times weekly and add high-quality herbivore pellet. Underfed tail spots will sample LPS coral mantles and Tridacna clams. Marine algae sheets, feeder magnets and herbivore pellet sit in the aquarium equipment range.
Reef Compatibility
Generally reef-safe but with the asterisk that hungry specimens may nip large-polyp stonies and Tridacna clam mantles. The fix is consistent algae provision — a tank with steady film algae growth almost never has problems. They actively reduce nuisance algae on display rockwork, which keeps the aquascape visually clean.
Tank Mate Compatibility
Peaceful with most reef fish. They tolerate clownfish, gobies, small wrasses, royal grammas and dwarf angels. Avoid pairing with other Ecsenius blennies in the same tank — territorial disputes turn nasty in confined nano spaces. Larger semi-aggressive fish like dottybacks may bully them off food, so add the blenny first if mixed stocking is planned.
Behaviour and Perching
Tail spots perch on rock ledges, peering at the room with comically expressive eyes. They dart between perches every few minutes and rarely swim in open water. Provide multiple ledges at varying heights from sand to upper rockwork — a rock pile with no flat perches stresses them. They are bold and quickly learn feeding routines.
Water Parameters and Flow
Standard reef parameters: 25-26°C, salinity 1.025, pH 8.1-8.4, alkalinity 8-9 dKH, nitrate 2-15 ppm. Tolerant of slightly elevated nutrients which actually encourage the film algae they graze. Moderate flow suits them — they are not strong swimmers and avoid laminar high-flow zones. RODI is essential; PUB tap chloramine wipes out their gut microbiome. Salt mix and RODI gear live in the marine saltwater range.
Quarantine
Tail spots are hardy and rarely import diseased. A 14-21 day observation in a quarantine tank with herbivore pellet and algae sheets is sufficient. They tolerate copper at standard reef-fish doses but rarely need it. Their main shipping issue is starvation during long transhipment — confirm feeding response before purchase.
Singapore Sourcing
Weekly imports through Iwarna, Aquamarin and most general marine shops. Pricing runs SGD 25-50 depending on size and supplier. RDC Reef Discus Centre and Petsmart marine occasionally stock them. They are abundant enough that quality should not require compromise — pick fish actively grazing rockwork in shop tanks rather than hiding in corners.
Long Term Care
Tail spot blennies live 5-8 years in healthy reefs. They become extremely tame, often perching on the front glass to greet their owner at feeding time. A nano-reef classic that pairs beautifully with clownfish, a yellow watchman goby and a few cleaner shrimp.
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emilynakatani
Still Have Questions About Your Tank?
Drop by Gensou Aquascaping — most walk-in questions get answered in under 10 minutes by someone who has set up hundreds of tanks.
5 Everton Park #01-34B, Singapore 080005 · Open daily 11am – 8pm
