Is Crystalwort a Good Plant for Least Killifish (Heterandria)?

Crystalwort fits inside the water range normally used for Least Killifish (Heterandria). The shared window is about 18 to 27 °C, pH 7 to 8, and 5 to 15 dGH, which gives you enough room to aim for stable middle-ground conditions.

Both do best with gentle, low-flow water, so circulation does not need to be split into competing zones.

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

Least Killifish (Heterandria) does not put unusual pressure on this plant compared with harder fish-plant combinations.

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.

This plant adds the denser cover that Least Killifish (Heterandria) usually appreciates.

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

Crystalwort is a moss / liverwort usually used floating.

Least Killifish (Heterandria) is a livebearer, 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 Least Killifish (Heterandria) can actually use that structure instead of hiding the plant where it cannot do much.

This is a sensible planted-tank choice for Least Killifish (Heterandria), 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 Least Killifish (Heterandria) actually swims, shelters, or uses cover.