My cherries, amanos, and 'blue berry' shrimp (which dont breed true at all) all seem to be quite content in ten gal tanks with tons of java moss, duckweed and driftwood. My substrate is aquabase but I would not recomend it... that stuff is horrible, its so dusty and scummy. But the shrimp seem to also love my spawning mops that I orginaly made for my rainbows to breed in cause now the shrimp hide in them, breed in them, and they are great for catching food for the shrimp. The spawing mops are simply yarn 'mops' with either a cork tied to the top or resting on the bottom. Something so simple... that works so well. My cherries seem to be in 7th heaven. Now if only my tank wasnt so darned big and I could catch some of those fast buggers to put in my office tank. LOL