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Is Undulata a Good Plant for Electric Blue Johannii?

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

Undulata can work with Electric Blue Johannii, 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. Fish pressure is the main concern, so the plant needs protection or a tougher substitute.

Undulata

Cryptocoryne undulata

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PlacementMidground
LightLow
DifficultyBeginner
Size25 × 20 cm

Electric Blue Johannii

Pseudotropheus johannii

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TemperamentAggressive
FamilyCichlids - African
Temp24–28°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

58/100

Possible, but the scape needs more care.

Water match

Workable overlap

Shared range: 24-28°C, pH 7.8-8, 10-15 dGH.

Plant pressure

High

Electric Blue Johannii may chew, uproot, or stress this plant.

Layout value

Moderate cover

Undulata helps with breaks lines of sight, good refuge for shrimp, and good grazing surface.

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
Undulata20-28°C
Electric Blue Johannii24-28°C

Overlap: 24-28°C.

pH
Undulata6-8
Electric Blue Johannii7.8-8.6

Overlap: pH 7.8-8.

Hardness
Undulata2-15 dGH
Electric Blue Johannii10-25 dGH

Overlap: 10-15 dGH.

Water and flow
UndulataFreshwater Only, Low (Still Water)
Electric Blue JohanniiFreshwater Only, Moderate (Standard)

Flow expectations are close enough for one layout.

Space used
UndulataMidground and Background
Electric Blue JohanniiMiddle (Open Water) and Bottom (Substrate)
Pressure signals
UndulataHigh uproot resistance, Standard leaves
Electric Blue JohanniiAggressive, Generally Aggressive, Aggressive to same species/look-alikes, and Territorial (Defends specific area)

Plant pressure: High.

Planting value
UndulataBreaks lines of sight, Good refuge for shrimp, and Good grazing surface, Nutrient-rich substrate preferred
Electric Blue JohanniiSand (Sifters) and Established Algae (Otocinclus)

Shared Tank Conditions

Undulata fits inside the water range normally used for Electric Blue Johannii. The shared window is about 24 to 28 °C, pH 7.8 to 8, and 10 to 15 dGH, which gives you enough room to aim for stable middle-ground conditions.

Their flow expectations are close enough to combine: Undulata prefers gentle, low-flow water, while Electric Blue Johannii prefers moderate flow.

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

Fish Pressure and Plant Resilience

Electric Blue Johannii puts heavy pressure on plants, so this species is likely to be chewed, uprooted, or stressed in day-to-day use.

Undulata has moderate cover density, high uproot resistance, and standard leaves. It can also help with breaking up sight lines, shrimp refuge, and grazing surfaces.

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

The point to watch is electric Blue Johannii may still investigate the plant, but the tougher foliage gives it a better chance.

Layout Fit

Undulata is a rosette / crown plant usually used midground and background.

Electric Blue Johannii is an African cichlid, so the pairing works best when the planting style supports how that fish uses space and cover.

Undulata reaches about 25 cm tall by 20 cm wide and is usually rooted in substrate with nutrient-rich substrate preferred. 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, shrimp refuge, and grazing surfaces. Place it where Electric Blue Johannii 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: Electric Blue Johannii may still investigate the plant, but the tougher foliage gives it a better chance.

Best Use Case

Undulata can work with Electric Blue Johannii, 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 Undulata and Electric Blue Johannii

Is Undulata a good plant for Electric Blue Johannii?

Undulata can work with Electric Blue Johannii, 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. Fish pressure is the main concern, so the plant needs protection or a tougher substitute.

Can Electric Blue Johannii damage Undulata?

Electric Blue Johannii may still investigate the plant, but the tougher foliage gives it a better chance.

Do Undulata and Electric Blue Johannii share the same water conditions?

Undulata and Electric Blue Johannii share a workable water window around 24 to 28 °C, pH 7.8 to 8, and 10 to 15 dGH. Keep the tank near the middle of that overlap for the best long-term result.

What does Undulata add to a tank with Electric Blue Johannii?

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

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

Electric Blue Johannii 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
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