PLEASE READ TILL THE END , THNX 
Hi guys , long time no see.
Dont know where to start , i got a infected fish a couple of month ago and thats where the problems began. Every month 1 of my fish die . The water parameters are JUST FINE , the level of nitrite is 0 and the nitrate is almost 0 , in a safe area like the test kit says. I change my water every week and its crystal clean. I have 2 filters , heater and an air pump.
4 of my angelfish died a couple of month ago , the things went well for a month , than my goldfish died , after a month my gourami and now the common pleco . BEFORE I GO TO SCHOOL OR A DAY BEFORE I CHECK MY FISH AND THEY ARE HEALTHY AND EATING , AFTER A DAY THEY ARE VERY SICK AND DIE WITHIN SOME HOURS. I think i have an infection , virus or something like that. How to remove and kill it before it affects my other fishes.

Hi guys , long time no see.
Dont know where to start , i got a infected fish a couple of month ago and thats where the problems began. Every month 1 of my fish die . The water parameters are JUST FINE , the level of nitrite is 0 and the nitrate is almost 0 , in a safe area like the test kit says. I change my water every week and its crystal clean. I have 2 filters , heater and an air pump.
4 of my angelfish died a couple of month ago , the things went well for a month , than my goldfish died , after a month my gourami and now the common pleco . BEFORE I GO TO SCHOOL OR A DAY BEFORE I CHECK MY FISH AND THEY ARE HEALTHY AND EATING , AFTER A DAY THEY ARE VERY SICK AND DIE WITHIN SOME HOURS. I think i have an infection , virus or something like that. How to remove and kill it before it affects my other fishes.