Fluval FX4 Aquarium Filter
Where to Buy
| Retailer | Price | Last seen | Buy |
|---|---|---|---|
 Pet Smart | $215.99 | Nov 28, 2024, may have changed | Buy Now |
 AliExpress | $237.84 | Mar 27, 2024, may have changed | Buy Now |
M Miscota.com | $271.32 | Mar 27, 2024, may have changed | Buy Now |
 Amazon Sold by BIG BOB'S ELECTRONICS | $275.00 | Jul 28, 2022, may have changed | Buy Now |
 walmart.com 90-day returns (in store too) | $279.00 | Jul 29, 2026, may have changed | Buy Now |
Prices are collected from retailer listings; each row shows the date we last saw that price. Return and shipping terms are each store's standard policy from our retailer research (April 2026). Some products and categories have different terms, so check with the store before you buy.
Used & Refurbished
✨ See 4 used & refurbished prices with ShopSavvy ProGet the app →Pros
- •Effective at keeping tanks clean and maintaining a healthy environment for fish and turtles
- •Suitable for tanks up to 150-200 gallons, with adjustable output for different tank sizes
- •Quiet operation, making it less disruptive in the living space
- •Easy to set up with simple instructions and tutorial videos, even if initially confusing
- •Handles messy turtle environments well and works for pumping water in larger tanks
- •Easy to clean and maintain, with readily available replacement parts
- •Provides versatile media options, allowing for customization and better biological filtration
- •Works well with existing filtration systems, enabling seamless transition
- •The replacement unit functions perfectly without further leaks after initial issues
- •Capable of handling both fish and turtle tanks effectively over several weeks with bi-weekly maintenance
Cons
- •Setup instructions are unclear, resulting in initial confusion and overflow flooding
- •Missing critical info about adjusting outflow, leading to water flooding during first use
- •Water flood and siphoning issues initially caused messes; research was needed to fix this
- •Motor failed after a few months, requiring replacement
- •Frequent need to replace parts incurs additional costs
- •Contended with a humming noise resembling a cheap exhaust fan
- •Initial leak from the motor seal within minutes, suggesting poor gasket quality
- •Replacing gasket and silicone did not fully fix leaks, hinting at manufacturing defects
- •Customer service was frustrating and unhelpful when issues arose
- •Slight cosmetic damage during shipping, though it didn’t affect performance
Bottom Line
While the **Fluval FX4** boasts impressive filtration power and generally reliable performance, its setup can be tricky without clear instructions. The initial leaks and motor failures are setbacks, but many users report that once properly assembled, it functions very well—particularly for large tanks and turtle environments. If you're an experienced aquarist willing to troubleshoot and invest in occasional repairs, this product can be a great long-term solution. However, first-time buyers should be aware of potential setup pitfalls and customer service concerns. For a more straightforward alternative with less fuss, consider checking out a model with even better customer support.
What Reviewers Are Saying
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Discussion
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