I have had none of the issues stated with my FX4 or FX6. But to be perfectly honest if I were looking to purchase another canister I would be looking at one of the SunSun filters other than the 704's or the HW3000 they got some bugs that need to be worked out from what I have gathered. I know this will upset the purists on the forum but so beit. I have been wanting to try a SunSun for awhile now, the price is just to low to not want to try one for yourself. There are plenty of folks that love these filters so last week I purchased a 303B for my 38 acrylic pentagon. I was shocked at how quiet this filter is. It holds a lot of media and for the price it can't be beat. I will see how long it lasts but judging from the research I have done , I can't see spending over 6 times as much for another FX filter again.
Later
NCH