Another vote for Red Cherry Shrimp. I bought 6 and have more than I can count. I keep up with my 50 % water changes and the tank is heavily planted so I suppose the conditions are good for them. I feed my fish generously and depend on the shrimp to clean up anything missed.
I've had ghost shrimp in the past and never had mine breed either (not that I noticed, anyway...)
I'd definitely cast another vote for red cherries. I put a 6-gallon shrimp tank on my desk at work. Started with 12 cherries back in April and now I've given away two big batches and still have at least 50 in there. I added 8 Endler's a couple of months ago and the shrimp ignore them completely. They're very easy and tolerant and fun to watch. The young have no larval stage. They hatch fully independent, so there's no special care required there, either.
Ghost shrimp creep me out...as do the stories of them eating other shrimp and the fins of sleeping fish :icon_eek:
I just ordered some red cherries from aquabid, by way of buying a pair of dwarf orange crayfish for $40. I did a search for RCS, and the crayfish came up because the seller was throwing them in to sweeten the deal...lol