Hi guys. I have an eheim 2217 which I've had running for a few weeks whilst cycling. Today I noticed a bunch of white specs floating in my tank (there are still no fish, just plants in the tank). When I turned off my air stone I noticed barely any agitation on the waters surface and although the specs of white stuff aren't so prevalent in the water (seem to have settled), I can see them coming out the spray bar of the filter, just slowly with less power than before . The filter is still humming as usual, but there does seem to be more noise than usual, like water gurgling from time to time, although I've never really listened out for any noise before so this could be normal. The only thing out of the ordinary that has happened is that I did a large water change yesterday and had the filter turned off for about 20-30mins. If anyone has any advice please share ASAP. Thanks.