I have a 55 gal tank and have 6 small angel fish in it. I have checked the water but what seems to happen is that when I turn the light out at night they seem to float to the bootom and just lay there as soon as I turn the light on they come back to life. When the float to the bottom its like they hardly move at all and sometimes get sucked up to the filter. Can anyone please help me out is there something wrong or is this normal. Someone told me that they are just relaxing but that is hard to believe. Thanks for any help