There's a couple of 6" 50 watt heaters you can pick up, visitherm & ebo jagger make one and marine land has a 6" for cheap.
It'd be close on a AC 200, but you could dremel a hole in the top plate as long as you can reach the water line you should be okay. I've aslo seen non-submersable heaters hooked up this way.
Another option if you're a DIY type is a heating module for a hot filter. Some of those are quite small, but getting it to fit would take a bit of work.
Hope it helps.
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