so these guys have been tank mate for 4months now ive had my jack for 4 years now and i introduced a power head to my tank about 3 weeks ago and they are tottly scared ****less of me and they hide all day and dont eat i havent turn the damn thing on for two weeks now and i keep the lights off what can i do to keep them from hiding and not eating please help there in a 55gallon with a fluval 405