Well I have one fish who seems to have some red above the gills...not sure of the type exactly, some kind of tetra, and she seems to swim sideways once in a while . Another fish I thought died yesterday, it was stuck to the filter, but when I went to take it out..he swam away but not very well, its been sitting at the top of the tank and having troble swiming, the filter's water pushes it around..Its a fancy guppie, are they sick..what should I do..I've had them a month and no problems, but all the sudden they aren't lookin so hot