Hello all, first noticed this about a week or so ago. At first my wife and I misidentified them as tetra eggs(have since found out we were wrong. I've been looking online and found possibilities from bio film to white algae, to fungus or bacteria. The tank is 120 gallons with varieties of mollies, tetras, shrimp and barbs. I also have a wide variety of plants from water sprite, crypto wendtii, micro swords and pogo octopus. I currently use root tabs, easy green and have an inline co2 diffuser. Any help would be appreciated.