Saltwater-Acclimated Molly — Poecilia spp. (Dalmatian, Yellow, Black, Orange)

Hardy, algae-grazing livebearer adapted to full marine salinity.

Quick facts

• Size: 5–8 cm

• Temperament: Peaceful

• Reef-safe: Yes

• Minimum tank: 60+ l / 16+ gal

• Role: Film and hair algae grazer; surface skimmer

• Origin: Captive-bred, acclimated to 35 ppt

Aquarium

• Water: pH 8.0–8.4, salinity 1.025–1.026, 24–26 °C.

• Flow: Low–moderate with calm surface zones.

• Cover: Recommended; good jumpers.

• Rockwork: Open areas plus shelter.

Diet

• Primary: Algae, biofilm.

• Feed: Spirulina flakes, herbivore pellets, nori; occasional mysis/roe.

Compatibility

• Community: Peaceful with most reef fish and inverts.

• Groups: Keep in small groups; 1 male to 2–3 females reduces chasing.

• Corals/clam: Safe; may pick only at nuisance algae on bases.

Breeding

• Livebearers. Females may drop fry in reef tanks; most fry become natural plankton. Provide macroalgae or breeder box if you plan to raise them.

Use cases

• New-tank “soft start” fish for light bioload.

• Algae control in sumps, frag tanks, and displays.

• Surface film reduction through constant sipping.

Selection checklist

• Rounded bellies, no clamped fins, steady surface activity.

• Eats algae and prepared foods at the shop.