OK I have a couple of these on my big tank and iv only had them on there for 1 month. I left my house the tank was perfect clear and looking good I get home and the tank is cloudy like it hasn't been cleaned in for ever then I noticed one of the fx6s was purging it's self randomly could this be why the tank looks like this? could the filter be that dirty after just one month? I'm just confused it's so random.