Endler's Livebearers

So much for getting a heater on Sunday. The orange tiny fish posted earlier were Endler's Livebearers. I bought 3 of them and then they all died one after another. I suspect it has something to do with the temperature. I thought those fish prefer warmer water so I got a heater. Well heater is now off, will see if the other two will survived. If not, then something must be wrong in the tank.

Also got a water plant of Banana Lily, always my favourite and this one I bought is especially green. Hopefully the picture can justify it. Why do I like this plant? The shape of each leaf resembles a heart.