I just netted out some food and in the course of doing so got some duckweed in the net aswell about to wash the net out into the sink when I noticed approx 1cm long and 0.5cm thick load of jelly. It was like frogspawn but in pellet form suspended below the duckweed. The residents of the tank are 3 female guppies, 2 male endlers, 1 male betta, 5 cherry shrimp of mixed sex, 2 amanos, 3 assassin snails, x amount of ramshorns snails, x amount of pond snails, approx 8 malaysian and dominican trumpet snails. As far as I know I can't think of any of these being the culprits however and there have been no recent plant additions which could of had hitchhikers. I assume its a snails eggs as it was upside down under duckweed in about the middle of the tank. I am fairly sure it wasn't the PS eggs and the Assassins scatter there eggs on stem plants, MTS give live birth the ramshorns jelly eggs are more opaque the ones in question were truly see through and seeminly only one on its own.