damn that is a big scratch! looks like it is on the outside, if so you can use toothpsate on it and it can reduce it.
I love this aquarium its like 10 nanos in one. Freaking amazing.
Your tank is very beautiful! I was wondering about your angelfish with your clams, do they do okay together?
And a group of five tiny trimma sp. (though I've searched the web I have not found this species):
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FYI. These aren't Trimma sp. which explain why you can't find reference.These are Coryphopterus personatus aka masked goby.