weird that you would like to keep algae. i'm sure you mean mosses and liverworts. mosses, pellia and moss balls[marimo are considered algae] would be suitable for your tank. congos may make a meal of your shrimp but with enough hiding places they should be fine. congos hangout at the top most of the time anyway.
you probably need things as you get into it. chiller would be good to keep temperature around 25-26c. [too low and you get condensation on the glass] silly i think...
normally people keep crs alone as breeding it is perilious with predators[fish] or perceived predators around.
HTH
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