Hello! I have a 125 gallon tank that I kept a huge RTcatfish in over the last year and a half! Over that time I had problems with the water turning like a (Greeny) color. I would say that over a month and a half ago the RTC died. So what I did was empty out the water 90% out and added some stress zyme and let the tank run for maybe 3 weeks! The water was CRYSTAL clear! I added 3 baby oscars and two baby konvicts. The first week the water was PERFECT! Now the damn water has turned back to that GREENY CLOUDY. I cant take this. Im ready to throw in the towel. What is this continuing to reoccur? My fish arent lethargic. The konvicts however are scrapping off the rocks but all are eating. Like I said I cant take this. Why is this happening? Thanks!