OMG....ITS the dreaded Tetra Eating round snail!!!!!!!
I have no idea what type of snail this is but I have em in my tank as well. They dont seem to be harming anything....just kinda cruise around and float sometimes....shell has air in it and is translucent.
100 Gal Planted, two Filstar XP3, Milwaukee SMS 122 pH controller, Milwaukee reg/bubble, compressed CO2, reactor 1000, 7 WCMM, 12 Ottos, 14 neons, 1 SAE, 3 German blue rams, 2 Florida Flag Fish
10 Gallon...20 Endler's live bearers planted, peat/kitty litter/sand substrate
15 Gallon...Just Schultz Aquatic Plant soil