Yeah, I hate running the fan 24/7, but if I don't I risk a temperature surge into the low 80's just as you experienced. Low 80's will cook the moss if left there for a day or two. The cooling system for these small nanos is worthless in the summer for Texas where I live, and it looks like you are in a much more tropical location........ I just keep the shrimp in mine, no fish. The cherries are tough and versatile, so they can handle some of the small parameter swings with KH and Ph. I lose a shrimp once in a while. What I don't like about my tank is the 6700K lights cast a yellow appearence, at least that is my understanding, and I have a constant yellow cast to the water. I have heard that 10,000K would add more white light to the tank and work as well as the 6700K lights? Anyone know if that is valid? If you want to keep the tank and not worry so much about temperature, go to walmart, kmart, radio shack, and buy a small clip on fan and blow it acroos the water. Works well. Radio shack has more options. They actually carry about 7-8 different sizes of computer cooling fans that can be wired into your system. Too much work for me though. The HC and glosso both have done well, when the shrimp aren't picking them out of the substrate!!! I just have small patches. The tank is dominated by the mosses. I will try and post some photos here.