My 3 Cichla Ocellaris are a little jumpy ... Every time I walk into the fishroom they scoot behind their piece of driftwood and emerge a minute or two later. I've had them for two months and are 4 inches long living in a 250 Gallon aquarium. Their diet consists of frozen prawn, krill or minnows (once a day) which they devour with reckless abandon. All water parmeters check out fine ... Any ideas as to why they're being so shy ...