The girl at my LFS tell me the new Fluval FX5 (professionnal) is a power horse with some nice feature. The girls is running it on a 125 Gal. tank with 18fish and a 36" Arrowana. She said she had two 2028 heinem before and try this new filter because the two heinem can't get the water celar. Now she get rid of one 2028 because this fluvial filter is realy amazing. Is anyone is using one of them? If you have any comment about this filter please feel free to reply.