Can Anyone ID This Plant?

I'm not very good with plant names. 

Does anyone recognise the plant, with red tips to the leaves, in the photos?

After looking again it may be ludwigia?

Hello Simon,

Spookily, in my fairly fruitless search for the "recommended" red plants in local LFS's, I think I may have bought a clump of this "on a whim". Of course, it wasn't labelled, and between watching the cricket, I have been trying to identify it! I think it could be an Alternanthera. The photo on the Aquarium Gardens website of A. reineckii lilacina looks similar, whereas photos on some others don't. If it is that, it will probably struggle I'm my 125l. But hey-ho, I had visited 3 LFS's and drawn a blank........so, in at the deep-end!

(Sorry I couldn't post the picture......I am waiting for a course of instruction from grand-daughter!)

                                                         Skittler

One of the problems with identifying aquatic plants is that they show what is known as "plasticity", that is they can exhibit a variety of quite different looking growth forms according to the conditions in which they are grown. Add to that the fact that particular forms have been artificially selected over they years for a particular look and it's a tricky business being certain of identification. The same applies even to the relatively well-studied British aquatic plants, so that many of the Water Crowfoots and plants of the genus Callitriche can only be reliably identified when they flower, and even then only by microscopic examination.

It looks like a plant I have in my tank, the underside of the leaves are red.