I vote on returning the dart when you get it and just to johns tomorrow and buy his, lol, hell, i'll go with you. i need to get some food anyways. LoL screw waiting, patience is for the weak...
Reefartist, i would get a flashlight and closely look at your sump, and check where those micro bubbles are coming from, microbubbles are a pain at the least, and it finally took a filter sock, a few prefilters and a wall of active carbon to eliminate mine.