The microchip off the FX5 for 2 minutes everyday to let air gets purged out of the system. Any pressurized canister filter is bound to have air inside it due to cavitation, which could spoil the impeller.
I wouldn't call that obviously biased "comparison" very good.
I mean, the reviewer's main theory is that the eheim is better because it cycled two days faster? And the FX5 has "too much" flow (tell that to the sump guys running over 10x turnover gph rates)? Didn't he realize you can simply crank down the flow on the FX5? And what, sponges in an FX5 don't count as media? They work as bio media too, look at sponge filters.
Well you can not go wrong with an Eheim. But to answer your question I would get the FX5 for that size tank. I also think that you are putting to much thought into the fact that the FX5 has a chip. Really!
Um, for a comparable eheim flow rated filter you're going to have to go for a 2262, which uses 80 watts. And the 2262 has less flow than the FX5 in the real world from the tests Harley K has done. Nothing wrong with Eheim, but your argument doesn't "hold water."
The eheim G160 does 330 GPH (which is half of what the fx5 pushes) but only uses 16 watts per hour. Rated for 160 gallon tank. Priced at $289.99 at The Pet Place.
The eheim 2262 is the best one to use, but it's discontinued.. was top of the line.. but it had a 900 gph mag drive pump on it which is why it uses so much electric. He can get away with using something other than this canister filter.
I run 2 eheims on my 240, and I bought them used.. it still uses LESS electric than 1 Fx5.
There have been tons of Fx5 issues.. clogging, breaking, the motors/impellers go out quickly- and they are just as expensive to buy replacements. The motor itself is $150.00.
Not to mention, you spend all this money on a filter, and you have to buy more media for it.
Go to the longest lasting equipment thread, you will see eheim's name all over it.
I have four FX-5's sitting around gathering dust. Maybe I can sell you one. I used them for years until I got sick and tired of cleaning them. I never had an issue with reliability, it's just that they're the worst filter to have to break down and clean. Wet dry sump filtration FTW.