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Is Creeping Jenny a Good Plant for Dusky Millions Fish?

Reviewed by Guidarium Editorial DeskUpdated May 4, 2026
Possible with Caution

Creeping Jenny can work with Dusky Millions Fish, but this is a possible with caution pairing. The plant may need a protected position, stronger anchoring, or companion plants before it feels reliable in day-to-day use. The match depends on anchoring and placement more than the water numbers alone.

Creeping Jenny

Lysimachia nummularia

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PlacementMidground
LightModerate
DifficultyBeginner
Size40 × 5 cm

Dusky Millions Fish

Phalloceros caudimaculatus

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TemperamentPeaceful
FamilyLivebearers
Temp16–24°C
Water TypeBrackish Tolerant

Quick Decision

A plant can be technically compatible with a fish and still fail in the actual tank if the fish digs, chews, needs denser cover, or uses a different part of the layout.

Overall fit

68/100

Possible, but the scape needs more care.

Water match

Workable overlap

Shared range: 16-24°C, pH 7-8, 8-15 dGH.

Plant pressure

Moderate

Creeping Jenny needs thoughtful placement and anchoring.

Layout value

Moderate cover

Creeping Jenny helps with breaks lines of sight and good refuge for fry.

Plant and Fish Fit Notes

Use these signals to decide whether the plant is doing useful work for the fish, or whether it is only surviving beside it.

Temperature
Creeping Jenny10-26°C
Dusky Millions Fish16-24°C

Overlap: 16-24°C.

pH
Creeping Jenny6-8
Dusky Millions Fish7-8

Overlap: pH 7-8.

Hardness
Creeping Jenny4-15 dGH
Dusky Millions Fish8-20 dGH

Overlap: 8-15 dGH.

Water and flow
Creeping JennyFreshwater Only, Moderate (Standard)
Dusky Millions FishBrackish Tolerant, Low (Still Water)

Flow expectations are close enough for one layout.

Space used
Creeping JennyMidground and Background
Dusky Millions FishTop (Surface) and Middle (Open Water)
Pressure signals
Creeping JennyLow uproot resistance, Standard leaves
Dusky Millions FishPeaceful, Hyperactive / Fast Swimmer, Plant Destroyer, and Fin Nipper

Plant pressure: Moderate.

Planting value
Creeping JennyBreaks lines of sight and Good refuge for fry, Inert substrate is fine
Dusky Millions FishPlants - Densely covered, Plants - Floating, and Established Algae (Otocinclus)

Shared Tank Conditions

Creeping Jenny fits inside the water range normally used for Dusky Millions Fish. The shared window is about 16 to 24 °C, pH 7 to 8, and 8 to 15 dGH, which gives you enough room to aim for stable middle-ground conditions.

Their flow expectations are close enough to combine: Creeping Jenny prefers moderate flow, while Dusky Millions Fish prefers gentle, low-flow water.

Water type can work if the tank stays in the shared part of freshwater and freshwater to lightly brackish water conditions.

Fish Pressure and Plant Resilience

Dusky Millions Fish can still be rough on plants, but this pairing becomes more realistic when the plant is anchored well and used as part of a larger layout.

Creeping Jenny has moderate cover density, low uproot resistance, and standard leaves. It can also help with breaking up sight lines and fry refuge.

Creeping Jenny is less tempting than softer, more palatable plants for known nibblers.

The point to watch is dusky Millions Fish may still investigate the plant, but the tougher foliage gives it a better chance.

Layout Fit

Creeping Jenny is a stem plant usually used midground and background.

Dusky Millions Fish is a livebearer, so the pairing works best when the planting style supports how that fish uses space and cover.

Creeping Jenny reaches about 40 cm tall by 5 cm wide and is usually rooted in substrate with inert substrate is fine. That makes placement and anchoring more important than simply adding a larger bunch of stems or leaves.

In this pairing, the useful plant values are line-of-sight breaks and fry refuge. Place it where Dusky Millions Fish can actually use that structure instead of hiding the plant where it cannot do much.

Practical Recommendation

Treat this as a managed pairing. Plant it securely, give it time to root or attach, and use other plants or hardscape if the fish needs more shelter than one species can provide.

The decision should center on this signal: Dusky Millions Fish may still investigate the plant, but the tougher foliage gives it a better chance.

Best Use Case

Creeping Jenny can work with Dusky Millions Fish, but only if you are honest about the pressure the fish puts on the layout. This is the kind of pairing that succeeds when the plant is chosen for a reason, protected by placement, and supported by a maintenance routine that anticipates damage or crowding.

Frequently Asked Questions About Creeping Jenny and Dusky Millions Fish

Is Creeping Jenny a good plant for Dusky Millions Fish?

Creeping Jenny can work with Dusky Millions Fish, but this is a possible with caution pairing. The plant may need a protected position, stronger anchoring, or companion plants before it feels reliable in day-to-day use. The match depends on anchoring and placement more than the water numbers alone.

Can Dusky Millions Fish damage Creeping Jenny?

Dusky Millions Fish may still investigate the plant, but the tougher foliage gives it a better chance.

Do Creeping Jenny and Dusky Millions Fish share the same water conditions?

Creeping Jenny and Dusky Millions Fish share a workable water window around 16 to 24 °C, pH 7 to 8, and 8 to 15 dGH. Keep the tank near the middle of that overlap for the best long-term result.

What does Creeping Jenny add to a tank with Dusky Millions Fish?

Creeping Jenny is less tempting than softer, more palatable plants for known nibblers.

What is the main risk in this plant and fish pairing?

Dusky Millions Fish may still investigate the plant, but the tougher foliage gives it a better chance.

Editorial Review

Guidarium Editorial Desk

Reviewed against Guidarium care, stocking, and compatibility standards. Read the editorial policy.

Last reviewed
May 4, 2026
Last updated
May 4, 2026
Issues or corrections?
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