I run a 404 on my 80fw and the rena filstar xp-2 on my 46fw and 50 brackish. I recently upgraded the the filters to the renas on both the 46 and 50. Prior to that I was running AC
hobs in conjunction with eheim eccos on the 2 tanks. I liked the eheims but their flowrate was less then the fluvals and renas, hence running with the AC
simultaneously. For ease of maintainance I prefer the Renas over the Fluvals. The Fluval is a bit quieter then the Rena though although neither really can be heard unless the room is completely quiet. I have been running my fluval for about 7 years now and never have had a problem with it. Of course if you go with the Rena get the xp-3 for the 55. Its fine for my 46 and 50 because the 46 is lightly stocked and eventually the 50 will be full marine so I will use a protein skimmer and LR
instead of the Rena
80 gallon FW
:3 clown loaches, 2 angels, bloodfin tetras and 1 albino BN pleco,1 Farlowella.
46 gallon FW
: kuhli loaches, otos, black neon and black phantom tetras, 3 pitbull plecos.
50 gallon SW
: 1 green spotted puffer