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well this is horrible I just bought this amazon sword plant from fish store and thought it was amazon leaf(the one that ppl said is easy to grow under low lightening) since my aquarium is only 20 g planted tank with like 17 neon/cardinal tetras with co 2 system install. And mostly low light over all only have 15w light tube installed. But since it in my living room I have 2x 40w light tube installed on the shealin(<-- not sure if this how u spell it my english is no good . And when I came home and read that amazon sword plant have to have good lightening and also good iron fertilizing<---which can be obtained from my liquid fertilizer. Wonder if I have enought light?

liquid fertiliser wont be enough for amazon swords, they need nutrients from their roots, not through the water. so you'll need solid plant tabs that goes under your gravel to help the sword plant.

i would say that amazon sword probably needs about at least 40+ watts of lights in your 20 gallon tank

Ok I see what I could do . maybe opening door on afternoon for sunlight to aim directly on it would be great? Cause the top part of my tank wouldn't aloud me to install more then 1 light tube and the highest wt light tube for my tank size I could find from fish store is a 15wt. I do have like 2x 15wt light tube but the only only aloud me to put in 1.

Swords get huge...I doubt a full grown sword would even fit in a 20g, much less thrive in a 20g...

IMO, swords only look decent in tanks over 125 gallons... otherwise they take up most of the tank

You might just want to take the thing back

I would take it back unless you want to grow it bigger and see if they'll give you more money for a larger plant. My amazon sword outgrew my 55g within about 5months. I planted some babies from it and when I upgrade my tank I'm going to pull it out and sell it back to the store. Amazon swords do need supplements such as iron but not in the water or the liquid type. They need solid root tabs or spikes shoved underneath them. Amazon swords can grow in fairly low light but I would consider 1wpg or 20w on your tank to be the lowest light level for growing plants. Room lights are not good for plants. The bulbs/tubes we use for house lights are really yellow and don't carry the correct spectrum of lighting. You need to be looking for tubes that are labelled daylight or say between 6500k-6700k. I've never heard of an amazon leaf and can't find any info on it. There is a narrow leaf amazon sword but I have no idea what plant you were looking for instead.

I think its java ferm sorry my bad mess up all the time. Oh well time to return it for another plants instead too much lightening is required for this one .

Java fern will survive in that light but it won't thrive. Mine never grows in under 1 wpg it just stays the same.