We've been having a problem with our 48 gallon for a couple weeks now. The tank has 3 Severums and 1 Parrot Cichlid. We've had the tank for about 2 years now with really no problems. The water has always been very clear. We do a 50% water change and gravel vacuum about every 3 weeks. The tank has an Aquatech 30-60 filter and we keep it right around 78-80 degrees. We have not added any new fish since the tank was set up 2 years ago.
The problem started a couple weeks ago when the water started getting green and cloudy. There really hasn't been an algae problem on the glass, only the water was getting green (the tank is in a dim room, with no direct sunlight). We immediately did a water change, but it didn't seem to clear it up, so we did another water change a couple days later, and then another after that. It seemed to help for a few days, but then the water started getting green again.
We bought some "Algae Control by Tetra" but that hasn't seemed to help. The fish haven't been eating for the past few days either
On top of that, one of the Severums has developed a weird problem on one side of his face and around his eye:
Here it is without the flash:
This is one of the "healthy" Severums:
We just did another 50% water change before taking these pics, so the water is still very cloudy.
We really need to get this cleared up, but we're not sure what to do. Please help!