Are two FX5s overkill for a 125?

[bigriver]

I would do it. I will be running an fx5 and 3 ac110's on my 125 when it all arrives thanks to tax returns with the fx5 it allows you to load it with bio material.

 

[Ramesh]

Believe it or not, I was only running AC110s on it. Weekly water tests were fine, but I still performed a 50% water change. I noticed that after adding a few extra fish that my levels changed dramatically. I now perform a 70% water change 2 times a week. The first FX5 will be here on Tuesday. That will give me a bit more clarity, but I'm thinking 2 FX5s with 2 AC110s would make my life much easier.

Thinking of two FX5's even before you have hooked up one is definately overkill. A bigger tank could be better tham more filtration in your situation especially if your fish are going to need a larger home.
One line of thought that lends weight to the bigger is better idea is that with more water comes more buffering from water changes. A 180g with an FX5 and 2 ac110s should keep your parameters in check especially with your water changing regime.

 

[Jgray152]

Let see about this.

2 AC110s = less than 2 liters of bio media @ 1000 GPH.....
- Mechanical Filtration Quality = 4
- Bio filtration = sucks when compairing.
- 28 watts

2 Fx5s
- Over 10 liters of bio media
- 1200 GPH
- 9.6 cycles per hour
- Mechanical Filtration Quality= 9
- Bio filtration quality = 10
- 105 watts

Fx5 + 2 AC110
- 7 Liters of bio media
- 1600 GPH
- 12.8 Cycles per hour
- Mechanical Filtration Quality = 6
- Biofiltration = 6
- 81 watts

 

[wow_it_esploded]

I do want to stress that more filters do not mean less water changes!

 

[GOTMLK]

No I'm getting ready to put my third FX5 on a tank this weekend. plus two Huge sponge filters.

how big is your tank?