Sorry not sure what the plant is, some sort of cold water fern the shop suggested. Looking at pictures online, I think it is Elodea Densa . There are three types of plants in there, 2 planted in the rocks and sand, and one floating.
I was a bit concerned at first about the placement near to a speaker but they do not appear to be bothered by it at all. Or am I just not noticing any distress?
And yeah, it hasn't been cheap which I didn't really factor in when I bought them but they are more than worth it! When I realised the room was too warm to keep the tank cool enough for the axies I had to do something about it. I know there are more low tech, cheaper methods, but I like the piece of mind the chiller provides.
Thank you all for your comments, they are appreciated.