At the end of January we bought a 10 gallon tank with a dwarf gourami, a few cherry barbs, couple zebras, and 2 cory catfish. Everything has been awesome. We clean and do regular water changes. The last full clean was 3 weeks ago after there was quite a bit of algae build up. The algae is back full force and water is cloudy. My major concern is our gourami. He stopped being himself (swimming and eating like a pig) about 4 days ago. Yesterday he started just sitting at the top, gasping for air, not moving,dying.. We did a huge water change and separated him for awhile, but didn't seem to help. All the other fish are fine and acting normal. I got an ammonia tester that is reading "safe". pH is high (reading blue) so I did get a decreaser. I've heard mixed things about decreasers but I'm desperate. Does any one have suggestions? I'm so frustrated and I don't want to watch him die without trying. I've heard they can get viruses which might explain why the other fish are fine. We are getting water ready to do a full cleaning on the tank... Help?