You might want to do swap out your moss for Fissidens instead. In a tank that small, you'll find mosses will quickly grow into a mess. As for the dark spot under the wood, I'd suggest to make another moss/fissidens pebble and place it there. You could also place some Nana Petite in there.
30W might be a little too high if you want to keep it simple and not use CO2. You want to try an 18W light out instead? I've got an Ocean Free set for sale. PM for details.
Call me Brian.
P.S. This is what part of the alphabet would look like if Q and R were eliminated.
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