Recently i been noticing hundreds, possibily thousands, of these white spot in my bio-filter. It looks almost like rose petals and the center has a brownish spot. it is very very tiny, smaller than a grain of rice. I been keeping my eye on my fish and everything seems normal. I do notice little bugs flying around and small dark creatures swimming around in my filter (gnats). Can someone help me indentify them and see if they are dangerous? thank you.