You could put them in a cup with some rubble or shells. That way they are away from the flow. Maybe take a couple days to attach.
Or you could get mesh, like what a bag of fruit or veggies come in, and rubber band the edges to the rock to make a little cage for the ric.
And once they attach to something, if you want them to be on the rock somewhere you can use reef epoxy or super glue.
Hey I'm in decatur too!