weird filter stuff

i have some weird stuff in my filter the last 2 times i checked....and more keeps coming... it looks like white rice stuff only really small. some are about 2mm some are a bit bigger and some are in clumps that still look like rice but crumble apart to smaller peices... it is sort of off white and doesn't desolve... i have never had this problem before and i have no idea what this gross stuff is....any ideas or suggestions would help....especially if you know what it is. thanx kris

i don't think that's it....i change my filter monthly and yesterday i found a ton of it in the gravel.....perhaps it is somehoe related to the ich they are getting over.....