hi all.. thanks for your help and advise... well, u guys seems to have difficulty in analyzing the symptoms... but i appreciate all you have told me.. well, i guess, it because of the food, i always feed them flakes and sometimes, pellets... that's all.. i never try anything like worms, etc.. etc... well, im gonna give it a try this time.. maybe its true that the food has something to do with their sickness.. In a five gallon, I have 2 bluemoon, 1 tiger barb, 1 albino platy and the sick one which is the silver platy...

thats all what's left.. the sick one, this time always wants to stay in the bottom... seems to have difficulty in breathing and still, her body is bended like half of it is paralyzed.. its kind'a weird.. but, thanks for all....