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So I ended up getting an Echinodorus Argentinensis XL. Have placed it in the back left corner. It's lovely and healthy with massive roots. Not as big as I expected but that's probably a good thing. I'll report back in a few months as to how it's getting on! I also got some Alternanthera Reineckii pink which I had in my old tank and seems to grow well in my water. Fish seem happy with the extra cover. Sorry for the bad photo and reflections, that was with the blinds closed... Thanks again for everyone's help.