Flora & Fauna
673 entries — care guides, placement tips, and notes from the community
Mermaid's Fan
Udotea flabellum
Elegant fan-shaped calcified macroalgae on a slender white stalk. Grows in sandy areas near reefs and seagrass beds. A beautiful decorative species for low-flow areas of the display tank. Like Penicillus, it anchors in deep sand and has a natural lifespan of several months.
Mermaid's Wine Glass
Acetabularia acetabulum
One of the most extraordinary organisms in biology — a single giant cell shaped like a wine glass on a slender stalk. Each 'plant' is a single cell that can grow to 10 cm. Famous in cell biology research. In aquariums it anchors in sand and is a remarkable conversation piece. Prefers cooler, calcium-rich water.
Midas Blenny
Ecsenius midas
Brilliant golden-yellow with a flowing, eel-like body. Often mimics Lyretail Anthias in colour. Perches on rockwork and darts into crevices when startled — reef-safe and entertaining to watch.
Montipora
Montipora sp.
Montipora is a diverse SPS coral genus second only to Acropora in species diversity, available in plating, branching, and encrusting growth forms in a wide array of colours. It is considered the entry-level SPS coral, more forgiving than Acropora but still demanding stable water parameters, high light, and good flow. Plating Montipora varieties are particularly popular for adding mid-level horizontal structure and bold colour to reef aquariums.
Mushroom Coral
Actinodiscus spp.
Mushroom corals (discosoma) are flat, fleshy soft corals available in a huge range of colours including green, blue, red, and metallic. They are excellent beginner corals, requiring low to medium light and tolerating nutrient-rich water better than SPS corals.
Mystery Wrasse
Pseudocheilinus ocellatus
Rare and stunning — white with bold yellow-outlined spots and red-tipped fins. A cryptic wrasse that stays hidden in the rockwork. Highly sought-after collector fish that commands a premium.
Naso Tang
Naso lituratus
Elegant tang with a characteristic orange-tipped rostrum, blue-trimmed fins, and long tail streamers in mature males. A graceful, active swimmer that needs a large tank. Excellent algae control.
Nassarius Snail
Nassarius sp.
Small sand-dwelling scavenger that buries itself and erupts from the substrate to feed on meaty detritus. Excellent sand bed aerator and clean-up crew staple.
Neomeris
Neomeris annulata
Tiny, elegant calcified algae with a barrel-shaped body ringed with white calcium bands at the tip. Short-lived (weeks to months) but reproduces readily in stable reef tanks. An interesting hitchhiker and occasional deliberate addition. Fish tend to leave it alone due to calcification.
Neon Goby
Elacatinus oceanops
Tiny electric-blue-striped goby renowned as a cleaner fish — will pick parasites from larger tank mates. Ideal for nano reefs. The Caribbean's answer to the cleaner wrasse.
Ocellaris Clownfish
Amphiprion ocellaris
The iconic clownfish made famous by Finding Nemo. Hardy, peaceful, and symbiotic with anemones. Excellent beginner saltwater fish.
Open Brain Coral
Trachyphyllia geoffroyi
Free-living LPS with dramatic maze-like ridges and vivid colours — green, red, blue, and multicolour morphs. Placed directly on sand; inflates impressively at night to feed. One of the most beautiful reef centrepieces.
Orchid Dottyback
Pseudochromis fridmani
Vivid orchid-purple throughout — one of the most coveted nano reef fish. A Red Sea endemic that is now tank-bred widely. Bold personality for its size; can be aggressive to smaller fish.
Pajama Cardinalfish
Sphaeramia nematoptera
Unmistakable with its yellow head, dark mid-band and polka-dotted orange rear — like a fish in pyjamas. Nocturnal schooler that hovers in groups near branching corals. Very peaceful and reef-safe.
Palythoa
Palythoa grandis
Large-polyped cousins of Zoanthids — drab tan-brown in the wild but cultivated morphs include greens, yellows, and reds. Hardy and fast-spreading. Contain palytoxin — handle with gloves. Excellent beginner coral.
Peacock's Tail
Padina pavonica
Fan-shaped brown-grey macroalgae with distinctive concentric rings and a lightly calcified surface. Grows on rock in moderate flow zones. Not commonly traded but attractive in display refugia. Tolerates a wide range of temperatures — found from Mediterranean rock pools to tropical reefs.
Peppermint Shrimp
Lysmata wurdemanni
Translucent shrimp with red stripes. Famous for eating Aiptasia pest anemones. An essential pest controller for reef tanks.
Pink Skunk Clownfish
Amphiprion perideraion
Pale pink-orange with a single white dorsal stripe and cheek bar. One of the smallest and most peaceful clownfish — ideal for nano reef tanks alongside Magnificent Anemones.
Pipe Organ Coral
Tubipora musica
Unique soft coral with a rigid, blood-red calcium carbonate skeleton and vivid green polyps. The skeleton resembles organ pipes — stunning when visible at the base. More demanding than most soft corals but worth the effort.
Pistol Shrimp
Alpheus randalli
Famous for its symbiosis with watchman gobies — the shrimp digs a burrow and the goby guards the entrance. Pairs perfectly with Yellow Watchman or Randall's Pistol Goby. Produces a loud snapping sound.
Pocillopora
Pocillopora spp.
Pocillopora is a branching SPS coral with densely packed round polyp heads giving it a cauliflower-like appearance. It is one of the more forgiving SPS corals for beginners to reef keeping, growing quickly under stable conditions. Available in green, pink, and purple morphs.
Porcupine Puffer
Diodon holocanthus
Endearing and personable puffer with large eyes and a round body covered in spines. Will eat inverts — FOWLR only. Develops a real personality and recognises its keeper.
Porites Coral
Porites lobata
Massively important reef-builder — slow-growing mounds and columns covered in tiny polyps. Host to Christmas Tree Worms and boring clams. Hardy for SPS; tolerates a wider range of conditions than Acropora.
Powder Blue Tang
Acanthurus leucosternon
One of the most beautiful tangs with a powder-blue body, yellow dorsal fin and black mask. Prone to ich and disease — best for experienced reef keepers.
Pulsing Xenia
Xenia spp.
Pulsing xenia is one of the most fascinating soft corals, rhythmically opening and closing its feathery polyps in a hypnotic pulse. It grows rapidly and can spread across rockwork quickly, so placement should be deliberate. Thrives in stable reef conditions.
Purple Firefish
Nemateleotris decora
One of the most visually striking nano reef fish — white to yellow body fading into vivid purple-magenta. Peaceful and reef-safe; will jump, so a tight lid is essential.
Purple Sea Fan
Gorgonia ventalina
The iconic purple fan-shaped gorgonian found throughout the Caribbean. Non-photosynthetic — requires regular target feeding with coral foods or phytoplankton. Grows in the plane perpendicular to current flow. A dramatic display piece.
Purple Tang
Zebrasoma xanthurum
Deep violet-purple with a bright yellow tail — one of the most desired tang species. A Red Sea endemic, now tank-raised. Aggressive toward other tangs so introduce with care.
Red Gracilaria
Gracilaria sp.
Bushy red-to-burgundy macroalgae prized as live food for herbivorous fish — tangs, rabbitfish, and urchins graze on it enthusiastically. Also an excellent nutrient exporter in refugia. Tumbles well under flow and tolerates a wide range of conditions.
Red Grape Algae
Botryocladia sp.
Rare and coveted — clusters of translucent, deep-red spherical bladders like bunches of miniature grapes. A showpiece macroalgae that attaches to live rock. Slow-growing and sensitive; requires stable, high-quality water. Highly sought after for display refugia and naturally deters herbivorous fish.
Regal Angelfish
Pygoplites diacanthus
Breathtakingly beautiful with alternating white-and-orange bars. Notoriously difficult to feed in captivity. Red Sea specimens generally adapt better than Pacific ones.
Ricordea Florida
Ricordea florida
Colourful mushroom coral covered in bumpy vesicles in shades of green, orange, and blue. Slower-growing than regular mushrooms. Hardy and great for beginners.
Ricordea Yuma
Ricordea yuma
The Indo-Pacific cousin of Ricordea florida — single-polyp mushroom with vivid nodular texture. Some of the most wildly colourful colourations in the hobby: electric blue, neon orange, purple, and multicolour. Highly collectible.
Royal Gramma
Gramma loreto
Arguably the most striking Caribbean reef fish — front half vivid purple, rear half bright yellow. Hardy, peaceful, and reef-safe. Tends to hang upside-down under ledges mimicking its cave habitat.
Sargassum
Sargassum natans
The iconic free-floating brown macroalgae of the open ocean — forms dense golden-brown mats in the Sargasso Sea. In aquariums it anchors to rock or tumbles freely. Hosts an entire ecosystem of cryptic animals (pipefish, frogfish, shrimp) in the wild. Challenging to keep long-term but impressive in large displays.
Saron Shrimp
Saron marmoratus
Beautifully mottled green and brown with long hairy appendages. Males develop an impressive brush of setae on their larger claw. Nocturnal and cryptic — hides by day but emerges at night. Can eat small invertebrates.