Has anyone heard of Healia? I brought an external filter, it is supposed to do 1200l/h (which i dont think its doing). I filled my tank 3 weeks ago had it running constantly, the gravel made a haze so i emptied the tank, washed gravel really well, and a small haze is still present even though the filter has been running for three weeks. added a peice of drift wood and it sent a SLIGHT dye through the tank, so i brought some Chemi Pure which replaces the active carbon in the filter and does a similar job but is alot better than active carbon. (had several people from experience with it tell me it works) I put the chemi pure in the filter this afternoon and while playing around i had noticed there is a build up of poop on the bottom( i have added four guppies, a tormented electric yellow from my smaller tank and a tormented albino shark from a mates tank), Now correct me if im wrong but isnt actve carbon meant to help break it down? if so why hasnt it? Does this mean my tank isnt cycled properly or does it mean my filter is a cheap rip off i got scammed into buyin??? im gettin my water tested tomorrow from an aquarium and hopefully they will be able to tell me everything is fine.