Easy
Black Molly (Poecilia sphenops black molly)
21–28°C · pH 7–8.5 · 81L
£3.99
One pair (a male and a female) of Green Sailfin Mollies (Poecilia velifera) per quantity, 5–6 cm or 6–7 cm. A large, peaceful livebearer for hard, alkaline water at 22–28°C in an aquarium with a base of at least 91 × 38 cm.
Colourful FishFreshwater FishModerate CareTropical Fish
Care at a Glance
Scientific Name
Poecilia velifera
Max Adult Size
up to 15 cm
Care Level
Easy
Temperament
Peaceful livebearer
Temperature
22–28°C
pH Range
7–8.5
Hardness
15–35 dGH
Minimum Tank
104L
Diet
Omnivore: vegetable-rich flake or pellet with greens and small frozen foods
Adult size is the maximum length this species reaches at full maturity (scientific sources). The livestock you receive will be younger and smaller — pick a size above for the actual shipping size. Product-photo provenance and any image-specific limitations are stated on the listing.
Water Parameters
Temperature
22–28°C
22°CIdeal28°C
pH Level
7–8.5
7Ideal8.5
Water Hardness
15–35 dGH
15 dGHIdeal35 dGH
Beginner Friendly
Peaceful
£17.99/ pairSold Out
Each quantity is one pair containing 2 fish. Discounts count pairs. Selected: 1 pair (2 fish).
1
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Live arrival guaranteed. If they don’t arrive healthy, email us a short unboxing video the same day for a replacement or refund. Packed in oxygenated bags with insulation and heat packs when needed.
£19.95 tracked delivery — half price (£9.98) from £100.00, free from £200.00. One delivery charge however many fish you add — everything travels together with a licensed live-animal courier.
Read our reviews on Google (opens Google Business Profile in a new tab) or see verified buyer reviews and photos. Human support, careful packing and clear delivery updates for live aquatics.
One pair (a male and a female) of Green Sailfin Mollies (Poecilia velifera) per quantity, 5–6 cm or 6–7 cm. A large, peaceful livebearer for hard, alkaline water at 22–28°C in an aquarium with a base of at least 91 × 38 cm.
Colourful FishFreshwater FishModerate CareTropical Fish
Care at a Glance
Scientific Name
Poecilia velifera
Max Adult Size
up to 15 cm
Care Level
Easy
Temperament
Peaceful livebearer
Temperature
22–28°C
pH Range
7–8.5
Hardness
15–35 dGH
Minimum Tank
104L
Diet
Omnivore: vegetable-rich flake or pellet with greens and small frozen foods
Adult size is the maximum length this species reaches at full maturity (scientific sources). The livestock you receive will be younger and smaller — pick a size above for the actual shipping size. Product-photo provenance and any image-specific limitations are stated on the listing.
Water Parameters
Maintain these water conditions for optimal health and vibrant colors
Temperature
22–28°C
22°CIdeal28°C
pH Level
7–8.5
7Ideal8.5
Water Hardness
15–35 dGH
15 dGHIdeal35 dGH
Green Sailfin Molly: a male and a female
The sailfin molly (Poecilia velifera) is a large livebearer from the coastal lowlands of south-eastern Mexico (Yucatán). The green form shows an olive-green body with a metallic sheen and fine spotting. Mature males raise a tall, sail-like dorsal fin; females are deeper-bodied with a smaller dorsal fin. FishBase and Seriously Fish give up to about 15 cm.
| Scientific name | Poecilia velifera (green form) |
|---|---|
| Family | Poeciliidae (livebearers) |
| Origin of the species | South-eastern Mexico (Yucatán) |
| Adult size | Up to about 15 cm |
| Temperature | 22–28°C |
| pH | 7.0–8.5 |
| Hardness | 15–35 dGH |
| Aquarium | Base of at least 91 × 38 cm (about 104 litres+) |
| Sold as | One pair (one male and one female) per quantity |
What you receive
Choose 5–6 cm or 6–7 cm, then the quantity. One quantity is one pair — one male and one female. Young males may not yet show the full sail fin; it develops as they mature.
Aquarium and water
A large, mature aquarium with a base of at least 91 × 38 cm (about 104 litres or more; bigger is better for adults), strong filtration and open swimming space. Sailfin mollies need hard, alkaline water: 22–28°C, pH 7.0–8.5 and 15–35 dGH (Seriously Fish). Keep nitrate low with regular partial water changes.
Feeding
An omnivore that grazes algae: feed a vegetable-rich flake or pellet daily, with blanched greens and small frozen foods for variety.
Tank mates and behaviour
Peaceful with other robust community fish that like hard water — platies, swordtails, larger rainbowfish and catfish. Avoid fin-nippers. Several females per male reduces chasing if you add more mollies later.
Follow the arrival sequence before releasing the fish
Tropical Fish Co’s delivery and Live Arrival Guarantee policy explains the packing and arrival procedure. Livestock is hand-bagged in pure oxygen and placed in an insulated poly box, with a heat pack when the weather calls for it. Someone must be at the address to receive the parcel because live animals cannot be left unattended.
- Receive the parcel in person and start filming before opening it. Show the parcel still sealed with the outer box visible.
- Open the parcel in one continuous take. Keep filming until the fish can be seen inside the sealed bag before anything is disturbed.
- Float the bag for 20–30 minutes so the temperature equalises slowly.
- Do not pour the bag water into the aquarium. Release the fish without adding transport water to the established system.
If a Live Arrival Guarantee claim is required, contact us on the same day with the order number and the continuous unboxing video. Before the parcel arrives, confirm that ammonia and nitrite read zero and that the aquarium matches the water values on this page.
Frequently asked questions
What do I get with one quantity?
One quantity is one pair: a male and a female Green Sailfin Molly.
How big do they get?
Up to about 15 cm as adults, so they need a large aquarium.
What water do they need?
Hard, alkaline water: 22–28°C, pH 7.0–8.5 and 15–35 dGH.
Will they breed?
Very likely. Mollies are livebearers; dense plants give the young somewhere to hide.
Public references
- FishBase: Poecilia velifera — identity, native range and size.
- Seriously Fish: Poecilia velifera — water conditions, aquarium size and behaviour.
- OATA: How to look after guppies and mollies — water quality, feeding and livebearer guidance.
- RSPCA aquarium environment guidance — biological filtration and the aquarium nitrogen cycle.
Customer Reviews
5.0 out of 5· 1 reviewIndependently collected by Judge.me from customers who bought this item. All reviews are shown.
- Anthony BealVerified buyer19 Sept 2026
Best fish I've brought online all theses stayed alive and no desieses