first, i would worry about getting another test kit, this could be part of you problem ,and another filter(may or maynot help) will not fix the problem , if it does anythign, it would hide a problem you are having, test parameters are very important in solving cloudiness issues, especially if there is something wrong with the water, seachem makes a relatively inexpensive master kit for sw(can't remember what they call it) and supposedly it is easy ot use and read, i would get one and go from there
and 3000, sounds like a rio pump(nto very good in my book)
also, same question appplies, is the any color to the cloudiness or anthign that may help with a better description(look like loose particles, or just hazey or anything like that)