First is I need help figuring what's going on with the temp in my 40g. I have a heater rated for 30-55g in it and right now it's set to 76 degrees. It has a single tube light fixture with a 36" tube over it. I keep the room the tank is in between 65-67 degrees. I also have three different thermometers in different parts of the tank to see what the temp is like overall. Now here's the problem, they all read between 78-82 degrees. I have no idea how it's happening. The one placed in the upper right corner reads 79.5, the one in the bottom left backside corner reads 82 and the on in the bottom back rightside corner reads 82. How is this possible? The heater rarely turns on and there's a good amount of water movement throughout the tank. I can't figure out why it's so hot in there but I doubt the fish appreciate it.
The second question is can blue-green algae (cyanobacteria) be transferred from one tank to another? My 5g has some plants that are doing really well but has a slight case of that algae in it and I'd like to move some to my 40g. While I'm been fixing the problem and winning it's been happening slowly but I think as long as I keep doing what I'm doing I could have it kicked soon. But in the meantime can I introduce it from one tank to another or does it need certain nutrients to survive? I believe I know the answer but figured I'd guess since it's a bacteria and not an algae.
My third and final question is, is this the beginning of hair algae? These are pictures from both my 5 and 40g. It's appeared around the same time and would like to get a jump on it if I can before it gets worse. I've never had hair algae before so that's why I'm looking for an i.d. It's kind of hard to see but if you look close around the edges of the leaves you can see it.