Is Nair's Lagenandra a Good Plant for Iridescent Shark?

Nair's Lagenandra fits inside the water range normally used for Iridescent Shark. The shared window is about 22 to 28 °C, pH 6.5 to 7.5, and 2 to 12 dGH, which gives you enough room to aim for stable middle-ground conditions.

Both do best with moderate flow, so circulation does not need to be split into competing zones.

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

Iridescent Shark does not put unusual pressure on this plant compared with harder fish-plant combinations.

Nair's Lagenandra has moderate cover density, high uproot resistance, and tough / leathery leaves. It can also help with breaking up sight lines, spawning sites, and shrimp refuge.

It gives Iridescent Shark useful visual shelter and line-of-sight breaks.

There is no special plant-pressure warning here, so solid anchoring and stable husbandry matter more than unusual protection.

Nair's Lagenandra is a rhizome / epiphyte plant usually used midground and attached to hardscape.

Iridescent Shark is a catfish, so the pairing works best when the planting style supports how that fish uses space and cover.

Nair's Lagenandra reaches about 20 cm tall by 20 cm wide and is usually roots anchored, rhizome exposed 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, spawning sites, and shrimp refuge. Place it where Iridescent Shark can actually use that structure instead of hiding the plant where it cannot do much.

This is a sensible planted-tank choice for Iridescent Shark, especially when you want the plant to do real work as cover, sight-line structure, or habitat detail.

The decision should center on layout quality: keep the plant in the zone where Iridescent Shark actually swims, shelters, or uses cover.