Can't get hot water from your tap?
I used to heat the water on the stove as well when I was startin out. It's tedious and risky. Sometimes you don't know the exact temp you're introducing to the tank and that can lead to annoying problems like ick.
If you could get a couple of cheap heaters (Radiant HOB's go for a couple bucks each online) and heat the water in the bucket, checking the temp with a thermometer would probably be a lot easier.
Chlorine is removed through aeration. You can let it stand open for a day or run an airline and airstone in a buck full of water for 12 and the water's safe to use. The recent problem is that many districts are adding chloramine into their municipal water sources and chloramines are not neutralized by aeration. A water conditioning prodict like Amquel+ or Prime will remove/neutralize both chlorine and chloramines.
To find out whether your water is alkaline or acidic you can get yourself some test kits or a master test kit. I really think you should look into purchasing online as supplies will usually be much cheaper there (even after shipping charges) than in a retail shop. Find a master test kit if you decide you can spend the money on it. This will come with pH, ammonia, nitrite, nitrate and GH/KH test kits (some kits may not have
everything). These come in
very handy. A crucial element for any serious fishkeeper are tests to know exactly what's going on with their water. Use the pH and GH/KH kits to find out what your water's like. I believe chain stores (Petco or Petsmart) may test the water for you but I've never asked.
You don't need coral skeletons. What you need is plenty of caves and hiding places for those fish.
You should also research on what their diets consist of. In the wild these fish feed on algae growing off the rocks and the tiny organisms living in the algae. In the aquarium they are considered herbivorous and should be fed a diet that comprises mainly of veggie and algae based formulas, fresh veggies, the occasional "snack" (community diets) or well rounded formulas that will not give your fish bloat. NLS is a popular diet reputed to give a herbivore all the exceptional nutrion it needs as well as not causing bloat. Stay away from live-foods, worms especially. Animal protein rich foods will cause a condition known as "Malawi Bloat". These fish may or may not swell, stop eating and waste away. I've killed several mbuna (including yellow labs) during my first weeks of keeping these fish by giving them such meaty snacks and can tell you it's a sad thing to see your fish starve to death, not being able to do anything about it and realizing that you were the cause.
Anyhoo, just to let you see just how I kept my mbuna and shed some light on the whole "decorating with rocks" idea here's a photo of my 60gl.
You can see many more examples
here.