I was given this plant by someone several years ago and stuck it into a planted tank with compost and volcanic rock on top. It has a slight stripe to it and in full sun sometimes goes red but at present it's in a window with only a couple of hours sun daily.

The 60litre tank is unheated now that the fish are gone, and receives no supplemental lighting. I only occasionally add some flourish excel to try and keep the hair algae at bay. Room temperature ranges from 5-25 C.

I wonder if it's a sword but the leaves are a bit small being a maximum of 2 inches in length.

aquatic plant

Random planting including Vallisneria. Lots of reflection artifact present.

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  • I LOVE aquariums. Why, Graham, are the fish gone? Someone else will know the name of this plant but plants like this in SOIL make incredible environments for fish. I'd never put my aquarium in sunlight. Well, I did once and COOKED all the fish! Your bulbs should be grow bulbs. You've got to have incredible filters and oxygenators and definitely a Plecostomus for cleaning algae...or two. Love those guys!! Tough part is finding a stable ecosystem where you don't have to clean manually! Out on a covered porch would be great for these plants but NEVER in direct sun...
    – stormy
    Jan 15 '17 at 23:03
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    It's a natural aquarium so no filters, and using sunlight instead of artificial lighting, and there's no CO2 injection. I don't have any algae on the glass as the plants outcompete the algae for the nitrates. I only had a Siamese fighting fish but he got mouth rot and perished. Jan 15 '17 at 23:15
  • I'd get a Pleco for sure. I am assuming fresh water. This should be an incredible environment for aquatic plants AND fish. I am trying to remember what mouth rot meant...what is the pH of this set up? Do you want fish? (How could you not)? Still, a natural aquarium is NEVER a natural aquarium!! Grins. But to add to your aquarium filters, bubblers ways to MOVE that water and exchange old for new water would make a far better aquarium. What I see is beautiful. For your fish to get a disease only means pH is off and your fish were stressed or something. What is the gallon size?
    – stormy
    Jan 15 '17 at 23:25
  • Amazon sword? What do you think? There are also tiny frogs and snails to add for a 'natural' aquarium as well as Plecos. Still have to have movement and exchange. Check that pH...plants can do better in more acidic water than the fishies are able to handle.
    – stormy
    Jan 15 '17 at 23:28
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    @stormy, I immediately thought it was Amazon Sword (Echinodorus bleheri) as well. Seems like an obvious. Answer away, in my opinion.
    – Brenn
    Jan 17 '17 at 4:23

I'd guess the less popular Echinodorus palifolius as this tends to be slightly smaller than Echinodorus bleheri and the existing plant seems mature. It may develop from slightly less pointed leaves. Also the stem is a large part of its height. However Kew Royal Botanic Gardens accepts 30 species of Echinodorus and Redwood Aquatics for example offers a total of a dozen varieties, including "Echinodorus Latafolius (Dwarf Chain)" that might refer to Echinodorus palifolius. "Amazon sword" may refer to various Echinodorus and naming in general is highly inconsistent.

Echinodorus (Image courtesy aquaportail.com)

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