Howdy, Can someone identify from the description below. I have notice some white round things stuck to the back glass and around the edge of the power heads and overflow pipes. They look like coco pods but are the size of a small Styrofoam pellet. I am not to sure what they are. The tank is a year old and has been doing great. They also seem to be in groups kinda like something laid eggs. I know a picture would be nice, but maybe won't be necessary. thanks for the help