I'm trying to identify these lil critters in my tank. I have lost 90% of my fish & 3 emerald crabs. My tank parameters are gold. dKH - 8.7 nitrates at 35.0 phosphate is at 0.13 salinity at 35ppm pH at 8.3 calcium at 450 magnesium at 1380. Now my acros are dying fast. Any help would be awesome. Current stop is 1 sixline wrasse, 1 sailfin, 2 firefish, 2 turbos & 6 hermit crabs