i have 4 gouramis in my tank 2 male and 2 female. about a year ago one of them died and she had excess mucus on her. she was fat and she looked pregnant.she swam for a while and then dropped to the floor and then got up swam and dropped again continuously. she was like that for a few weeks and then she died(she was fat for a few weeks). i checked my tank and the test showed some ammonia. so i read the leaflet and it said ammonia could cause excess mucus.so i thought no more of it. once the ammonia was 0, i got a new female. now she is fat and she is laying on the bottom swimming every now and then.she is as i guess dieing. i dont think she has more than a day now. i noticed the male has not made any bubblenests so i assume it was not pregnancy. i really need some help so i can help the other female if it happens again. i would really really appreciate some help. plz plz plz. thanks very much.