white worm eggs bro. These are very tiny little sh*ts which live in the rocks and obviously like filters. It's very common to see some of what you got in filters certain times of year (and very annoying). The become more invasive and breed heavy due to over feeding, bad water conditions, and not frequent filter cleaning. Clean more regularly, clean filter with sponge and get all them off there. Salt your tank up (add salt), clean gravel and don't over feed. Keep this up for a few weeks and should be gone. Note i gave normal reasons not saying your a bad fish keeper it happens..