Is Crystalwort a Good Plant for Figure 8 Puffer (Brackish)?

Reviewed by Guidarium Editorial DeskUpdated April 28, 2026

Not Recommended

Crystalwort is not recommended for Figure 8 Puffer (Brackish). The issue is practical, not cosmetic: they are adapted to different water types.

Crystalwort

Riccia fluitans

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PlacementFloating

LightModerate

DifficultyBeginner

Size5 × 15 cm

Figure 8 Puffer (Brackish)

Dichotomyctere ocellatus

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TemperamentAggressive

FamilyPuffers

Temp24–28°C

Water TypeBrackish Required

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

46/100

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

Water match

Limited overlap

One or more core water ranges does not overlap cleanly.

Plant pressure

Moderate

Crystalwort needs thoughtful placement and anchoring.

Layout value

High cover

Crystalwort helps with provides surface cover, good refuge for fry, good refuge for shrimp, 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.

FactorCrystalwortFigure 8 Puffer (Brackish)

Temperature

Crystalwort15-30°C

Figure 8 Puffer (Brackish)24-28°C

Overlap: 24-28°C.

Crystalwort6-8

Figure 8 Puffer (Brackish)7.5-8.5

Overlap: pH 7.5-8.

Hardness

Crystalwort2-15 dGH

Figure 8 Puffer (Brackish)10-25 dGH

Overlap: 10-15 dGH.

Water and flow

CrystalwortFreshwater Only, Low (Still Water)

Figure 8 Puffer (Brackish)Brackish Required, Moderate (Standard)

Flow expectations are close enough for one layout.

Space used

CrystalwortFloating

Figure 8 Puffer (Brackish)Middle (Open Water) and Bottom (Substrate)

Pressure signals

CrystalwortLow uproot resistance, Delicate leaves

Figure 8 Puffer (Brackish)Aggressive, Snail Eater, Shrimp Eater, and Fin Nipper

Plant pressure: Moderate.

Planting value

CrystalwortProvides surface cover, Good refuge for fry, Good refuge for shrimp, and Useful spawning site, No substrate required

Figure 8 Puffer (Brackish)Sand (Sifters) and Shells (Breeding/Hiding)

Shared Tank Conditions

Crystalwort and Figure 8 Puffer (Brackish) do not share a clean environmental window, so the pairing is already under pressure before behaviour is even considered.

Their flow expectations are close enough to combine: Crystalwort prefers gentle, low-flow water, while Figure 8 Puffer (Brackish) prefers moderate flow.

Water type is a serious mismatch: Crystalwort is listed for freshwater, while Figure 8 Puffer (Brackish) is listed for brackish water.

Fish Pressure and Plant Resilience

Figure 8 Puffer (Brackish) 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.

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

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

The limiting issue is they are adapted to different water types.

Layout Fit

Crystalwort is a moss / liverwort usually used floating.

Figure 8 Puffer (Brackish) is a puffer, so the pairing works best when the planting style supports how that fish uses space and cover.

Crystalwort reaches about 5 cm tall by 15 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, and spawning sites. Place it where Figure 8 Puffer (Brackish) 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: They are adapted to different water types.

Best Use Case

Crystalwort is usually the wrong plant for Figure 8 Puffer (Brackish) 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.