The last time I bought some anarchis, in bunches, it came with wildlife I just yesterday, after some research, decided was a kind of small shrimp called a "scud" (or gammeris [sp?]). I rescued a few and put them, along with some common ram red snails, in a jar, then a small one-cup size bowl, and just recently a one-quart clear acrylic container, the better to watch the scud zoom around. Normally I'd find them unwatchable (there are better things to be fascinated by), but I have discovered something interesting about them. I put bottom cuttings from the original anarchis in with them, since I figured the scud lived their when I bought the plant, they could continue to do so. I get several kinds of algae in my ten gallon tank, including an irritating one that might be beard algae (dark, dark green, maybe 1/4" long, in loose bunches). I usually snip off leaves or branches, in the case of bacopa or even anarchis. I started dropping these trimmings in the scud container. I put a branch of bacopa with algae on it (both the stringy kind and a coating green kind) in the container just yesterday -- and this morning I can't be sure which branch it was because everything is clean (except the rock with algae on it I put in yesterday, too, but it's getting cleaner). I know the scud were exploring it, and I think they work faster because there are more of them than there are snails. As the plants recuperate and put out roots, I'll return them to the original tank. I am currently trying to decide how to introduce the scud to the big tank, too. It probably already has some (it's hard to tell in the beige-colored landscape rocks), but either not enough to do a good job keeping down the algae, or my tetras and/or the pygmy cories (see pic at your left) are eating the little scud. If I can keep the scud alive and going in the one-quart container, I'll probably wind up siphoning some out and squirting them into the 10G to see what happens. Maybe they'll they thrive, eat the algae and left-over food/old leaves, and the fish will control any population boom.
I don't know if you can buy scud/Gammeris, or if you just have to hope you get some by (lucky) mistake.