Maybe you had baby Ghosties? The Amano shrimp would be much better algae cleaners which is why I mentioned them. I also like Oto cats (Otocinclus). Have you seen them? A lot of people keep them with Bettas. You do need several but they are really spiffy.
The Planted Tank invertebrate form says Bamboo shrimp are difficult because they are filter feeders (I had to look that up). Amanos are a piece of cake.
Every tank species is different. My Betta Si completely ignores my RCS; Willie would eat them they weren't too big (most are at least 1/2"). On the other hand, Si follows the Assassin snails around like a Bloodhound while Willie couldn't care less and completely ignores them.
I do know it took the shrimp quite a while to live freely with a predator. I barely saw them for two weeks except at feeding time; now they are out all of the time.
Sorry if I seem argumentative; rereading my post I did come across that way. So I apologize.