Just replaced an aging toilet in my basement with a Toto Drake. After a few days of "use" I noticed a small amount of water along the side of the toilet that sits on the bare concrete basement floor. A little background first, the old toilet was fastenened to the floor using two bolts which screwed into the concrete, no flange was used, it never leaked. It sat on a ~4" cast iron waste pipe that was not flush to the floor but rather was above the floor surface 1/2" to 5/8". I was told to grind the waste pipe to at least 1/4" before putting the new Toto in, which I did. I put a single wax ring on (with the plastic flange), put a bead of caulk around the back end of the Toto and lowered it onto the waste pipe opening and bolted it to the floor. It was fine for 4-5 days until yesterday when I noticed the water at the base. My question to all of you fine folks is there a leak because: I should have ground the waste pipe flush to the basement floor rather than leaving a 1/4" lip above the surface; didn't use a thicker,larger wax ring that was available; maybe I didn't center the Toto into the waste pipe correctly before securing it to the floor??? Obviously I am a weekend plumber and I really would appreciate any advice you can give me. Also sorry for the long thread.