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Is Water Fern a Good Plant for Cigar Shark (Mad Barb)?

Reviewed by Guidarium Editorial DeskUpdated May 3, 2026
Not Recommended

Water Fern is not recommended for Cigar Shark (Mad Barb). The issue is practical, not cosmetic: the fish wants a very different current pattern than the plant prefers.

Water Fern

Azolla filiculoides

View plant profile
PlacementFloating
LightModerate
DifficultyBeginner
Size1.5 × 2.5 cm

Cigar Shark (Mad Barb)

Leptobarbus hoevenii

View fish profile
TemperamentMostly Peaceful
FamilyCyprinids
Temp23–28°C
Water TypeFreshwater Only

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

48/100

The fish is likely to outgrow, uproot, or out-pressure the plant.

Water match

Workable overlap

Shared range: 23-28°C, pH 6-8, 4-15 dGH.

Plant pressure

High

Cigar Shark (Mad Barb) may chew, uproot, or stress this plant.

Layout value

High cover

Water Fern helps with provides surface cover, good refuge for fry, good refuge for shrimp, good grazing surface, and useful spawning site.

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
Water Fern10-30°C
Cigar Shark (Mad Barb)23-28°C

Overlap: 23-28°C.

pH
Water Fern5-8
Cigar Shark (Mad Barb)6-8

Overlap: pH 6-8.

Hardness
Water Fern2-15 dGH
Cigar Shark (Mad Barb)4-15 dGH

Overlap: 4-15 dGH.

Water and flow
Water FernFreshwater Only, Low (Still Water)
Cigar Shark (Mad Barb)Freshwater Only, High (River/Stream)

Flow expectations point in different directions.

Space used
Water FernFloating
Cigar Shark (Mad Barb)Middle (Open Water) and Top (Surface)
Pressure signals
Water FernLow uproot resistance, Delicate leaves
Cigar Shark (Mad Barb)Mostly Peaceful, Hyperactive / Fast Swimmer, Jumper (Lid Required), and Piscivore (Eats small/nano fish)

Plant pressure: High.

Planting value
Water FernProvides surface cover, Good refuge for fry, Good refuge for shrimp, Good grazing surface, and Useful spawning site, No substrate required
Cigar Shark (Mad Barb)Smooth Gravel (Sensitive Barbels)

Shared Tank Conditions

Water Fern fits inside the water range normally used for Cigar Shark (Mad Barb). The shared window is about 23 to 28 °C, pH 6 to 8, and 4 to 15 dGH, which gives you enough room to aim for stable middle-ground conditions.

Flow is another friction point because Water Fern prefers gentle, low-flow water while Cigar Shark (Mad Barb) prefers strong, stream-style flow.

Both are suited to freshwater, so salinity does not add an extra planning problem.

Fish Pressure and Plant Resilience

Cigar Shark (Mad Barb) puts heavy pressure on plants, so this species is likely to be chewed, uprooted, or stressed in day-to-day use.

Water Fern has high cover density, low uproot resistance, and delicate leaves. It can also help with surface cover, fry refuge, shrimp refuge, grazing surfaces, and spawning sites.

Its structure adds useful refuge value beyond the normal visual role of the plant.

The limiting issue is the fish wants a very different current pattern than the plant prefers.

Layout Fit

Water Fern is a floating plant usually used floating.

Cigar Shark (Mad Barb) is a cyprinid, so the pairing works best when the planting style supports how that fish uses space and cover.

Water Fern reaches about 1.5 cm tall by 2.5 cm wide and is usually free-floating with no substrate required. 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 surface cover, fry refuge, shrimp refuge, grazing surfaces, and spawning sites. Place it where Cigar Shark (Mad Barb) can actually use that structure instead of hiding the plant where it cannot do much.

Practical Recommendation

For most keepers, a tougher or better-matched plant is the smarter choice. If you still try it, test with a small amount first and be ready to move the plant before it is badly damaged.

The decision should center on this signal: The fish wants a very different current pattern than the plant prefers.

Best Use Case

Water Fern is usually the wrong plant for Cigar Shark (Mad Barb) if your goal is a stable display tank. The issue is rarely one dramatic failure on day one; it is the steady mismatch between what the fish does in the scape and what the plant needs to stay attractive long term.

Frequently Asked Questions About Water Fern and Cigar Shark (Mad Barb)

Is Water Fern a good plant for Cigar Shark (Mad Barb)?

Water Fern is not recommended for Cigar Shark (Mad Barb). The issue is practical, not cosmetic: the fish wants a very different current pattern than the plant prefers.

Can Cigar Shark (Mad Barb) damage Water Fern?

The fish wants a very different current pattern than the plant prefers.

Do Water Fern and Cigar Shark (Mad Barb) share the same water conditions?

Water Fern and Cigar Shark (Mad Barb) share a workable water window around 23 to 28 °C, pH 6 to 8, and 4 to 15 dGH. Keep the tank near the middle of that overlap for the best long-term result.

What does Water Fern add to a tank with Cigar Shark (Mad Barb)?

Its structure adds useful refuge value beyond the normal visual role of the plant.

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

The fish wants a very different current pattern than the plant prefers.

Editorial Review

Guidarium Editorial Desk

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

Last reviewed
May 3, 2026
Last updated
May 3, 2026
Issues or corrections?
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