hi all, new to the site and have a question i cant seem to resolve! just bought a second hand ocean free 3ft tank with eheim 2224 external filter. to be honest (sorry for the bluntness, its getting very frustrating) its either rubbish or faulty. i had set up the new tank and it looked lovely, then after a while the water went cloudy,re-cleaned all pipes, replaced filter media with brand new ones etc. but by the time this happened i had already added the fish so local shop recommended filter aid. it worked well but a few days later my tank is full of little particles/bits and is very cloudy again. all pipes are clean, no kinks in them, doesnt appear to be any blockages, water quality is all good . i have never used an external filter before and have no idea what else could be the problem. many thanks x