Sorry Goreef, I've been traveling and haven't checked the forum in a few days. Here's a picture of my tank - taken with my phone, so sorry for the blurry fish:
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How is your tusk doing? Started eating yet? So far everything you've described is consistent with my experience, even the swimming only at night. Like I said, it took nearly a month for him to get comfortable and start eating, but eventually he did and he's been doing great ever since.
Oh, and the goby was in the tank long before the tusk. I've got another in there too, an orange striped shrimp goby. He seems to be smarter than the watchman and bolts for his cave whenever the tusk or triggers get near.