i have been rearing drawf gourami (colisa laila) for more than 6 months now. todate almost 50 of them had perished since then. it's always the same old case. They will be fine for the first 5 days, then one by one will die. but the females die faster than the males. my tank is around 8 liters big, and at one time there will be 8 of them around. i put real plants, but after sometime, i stick with the fake ones. i found out that the real plants will actually cause them to die. anyway, my filter is the bubble filter inside the tank. i found out that there is the white spot disease affecting them. every 2weeks, i will clean the tank and put RO water. the gravel and other plastic items will be soak in boiling water. this helps a bit, but once a while the fishes will die again. then, i tried putting the blue medicine, but to no avail.sigh...

just wondering, what else can i do??