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My new 180g setup is using 1 Fluval FX6. It is working well and I'm happy with it but can't shake feeling my eggs are all in one basket.

Please recommend a filter for backup. Two FX6s are not affordable. Are there reasonable alternatives?

 

[allathlete5]

I've heard some great things about the sunsun hw-304b, much more affordable and should be able to hold the 180 over if the fx6 were to break. Much more affordable than the FX6, although it obviously isn't directly comparable... I'm sure it would be a great addition to your tank