my shrimp crawl out of the water too. they are cherry shrimp. they don't go that far out of the water that i've seen but i have a filter that i just use for water movement that is sort of a veggie filter i guess and they climb up onto that. it's just an internal hob that has a small peice of aquaclear sponge in it and a TON of bocopa growing out the top of it and it's full of riccia. they love climbing on it and the tank has ample oxygenation. but like i said, mine don't go that far out of the water.