I'm debating between the filstar xP3 and the fluval 404 for my 75 gallon tank. I was wondering if you have to buy replacement parts for either of these often. I looked online, and I saw all the replacement parts, but no mention on how often you need to replace them. (Or do you just replace things when they break). Also, do these two come with everything needed? For some reason, I 'm leaning towards the fluval, but the filstar is made for more gallons of water, so I'm still unsure. Any help or input is appreciated.
Thanks 

