revision preference src: The water fleas are repelled by this color of light, flee downwards and pass through holes in a false bottom of the aquaria. Fish are residing in the lower sections of the aquaria and most of the water fleas are immediately wiped out. <SEP> tgt: The water fleas are repelled by this color of light, flee downwards and pass through holes in a false bottom of the aquaria. However, fish are residing in the lower sections of the aquaria and most of the water fleas are immediately wiped out.