Thanks for advice, i took out the bio wheel, was careful nopt to touch it, and swished it around in a bucket with tank water in it, also i washed the impeller, and intake tube ( didnt know i had to do that) oh YUCKKKKKK , the gunk inside was revolting,

, also i took out the filter and gave that a swish too, cant believe it was so mucky, anyway put it all back together and it seems much better, wheel still a little erratic, but better than it was, hope i did right, thanks again, this site is ace. one more thing, if the filter get so full of gooey gunk, should i change it for a new one? or just wash it? i know u dont change the wheel.
