should be fine.. its a nice easy plant provided it has enough ferts. Also easy to farm quite a quantity from not very much so its cheap as well. Weekly trimming is fine.. you could get away with less than that.
I agree with Ed here it's a lovely little plant a bit like four-leaf clover n definitely slower growing than glosso. Another alternative is Bacopa Australis.
Conversely if you wanted a more 'grasslike' carpet, provided light is of a sufficiently high intensity & it's not overshadowed by surrounding plants, Lilaeopsis Brasiliensis will give you a very nice slow growing foreground lawn
I've not personally had any experience with Bacopa Australis but came across it in my 2007/8 catalogue & was looking at it with interest possibly for my next tank? Here's a quote from Tropica:
"Bacopa australis was discovered in southern Brazil (australis = southern), and it does not come from Australia, as might otherwise be assumed from its name. Like the other Bacopa species, Bacopa australis is also easy to grow in an aquarium. Under certain conditions it creeps across the bottom to form an elegantly decorative light green cushion. When Bacopa australis grows in a good light, the leaves become reddish. It is easily propagated by taking side shoots and planting them in the substrate."
If anyone has been able to grow it like this I'd be interested to know the conditions?
Shame about the rotala rotundifolia!lol but yeah that Oliver Knott link is interesting thanks, that bacopa looks how yours sounds if you catch my drift!?
Also that tank is deep at 70cm, maybe it needs very intense light to stop it reaching up & to carpet, sound plausible?
How deep is your tank from the substrate & how many wpg?