Earlier this year I cleared out a 75 and started a native tank. I collected 6 Blacknose dace and put them in there. Couple nights later I'm doing a water change, and as I start putting the hose down in the water, I feel something "nipping" at the back of my hand. I look over and there's one of the dace darting around my hand. Then he starts racing around the hose (Lee Gravel Vac). He swims away and I'm going about my business. I'm just pulling water out, wasn't vacuuming gravel so the hose end is only about 6-8 inches below the surface. All of a sudden he comes racing over and swims right up the tube!!! Happened so fast I couldn't believe it. I turn the valve to the OFF position and try to shake him loose, he's in the fitting halfway. I walk over to the sink and reverse the flow, he comes down and is just kind of floating around, bobbing and stuff. I figure "ah, crap, he's dead", then after about 30 seconds he starts to swim, rather unsteadily. I keep an eye on him for the rest of the water change and about 30 minutes after that. Checked Sunday AM, he was still alive. Got some pretty nasty abrasions on the head and back and one eye was a little popped out. He died 2 days later.