Tailspin,
We were just there in August as well, and I was able to get wireless in my room. It was not a real strong signal, but it was a reasonably good connection. You won't need converters or anything. You might want to bring a small travel surge protector though, as the power does fluctuate from time to time and went out once for about 5 minutes while we were there.
As for the groupers and lionfish, when we were there, the sharks were getting far more interested than the groupers. The groupers were still friendly and would hang around, but the sharks were getting agitated when they saw a DM with a lionfish on a spear. We were there the 2nd week the DMs had been using the spear slings, and there were at least 2 sharks that had already been well conditioned to come around for a look when they heard that sound. By the time we were leaving, the DMs were starting to get concerned that they were encouraging the sharks to associate humans with food.