80-82 isn't going to cause short term problems with the fish you listed. That's not outside the range of their native environments and can be a degree or two higher at times. Long term, the increased temperature will speed growth and shorten lifespan most notably with the guppies. I've used temperatures in that range to speed up grow out when I was raising them for sale.
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how it's done or even where to start.
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The easy way is to have a simple small hole drilled in the tank at the top and have that plumbed to a drain line or place the water can leave to. If the tank's already up then the addition of an overflow box like the people with sumps use to get water down to their wet dry filters under the tank. I prefer drilled myself and any brand can have the top glass drilled for around $20. I think I paid my saltwater dealer $18 last time and had the fitting for the hole thrown in with the price.
For the incoming water just tap onto the closest cold water line in the house. The line can be small. I've used 1/2 inch lines so far but I'll probably drop to 1/4 inch next time. Run that up the back of the tank to the top with a small valve to adjust flow. A couple elbows get you over into the tank.
Water comes in one side, out the other.
There are plenty of alternative routing options including getting the predrilled tanks with the holes already in the bottom. I'm starting to get a little more complicatted myself. I've got a 40 and 75 tied together now. Water comes in the 40 and travels through the 40 then onto the 75 gallon before exitting and I could have routed that to one of my ponds.
http://s140.photobucket.com/albums/r...urrent=40c.jpg 
