Filters · Hang-on-back
Tetra Whisper IQ 45
Adjustable 20–215 GPH flow; Tetra gives no tank size.
Adjustable-flow HOB filter with a motor sound barrier and Large Bio-Bag cartridge.
Consider: Its 20 GPH minimum is higher than the IQ 20’s 10 GPH minimum. If very gentle output is the priority, compare that lower-flow model before choosing.
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US version, item 78003. Check what’s in the box before you buy.
Tank size Tetra rates it for
Range not published
Choose your tank to see where it falls.
Check it against your tank →Specifications that affect fit
- Manufacturer capacity
- Not published
- Power
- Not published
- Supply voltage
- Not published
- Dimensions
- Not published
- Pump output
- Not published
- Filter circulation
- Not published
- Maximum flow
- 215 GPH
To see what it costs to run, enter the watts on its label and your daily hours in the electricity cost calculator.
Pump output, filter circulation and maximum flow are measured in different ways. Your filter will move less water than the box says once media and hoses are in. Measure it with the flow calculator.
Before choosing this model
- Confirm model 78003.
- Check minimum flow against fish and planting needs.
What Tetra doesn’t publish
- Tetra doesn’t publish a tank size or the filter’s body size. If you are buying for a particular tank size or a tight gap behind the tank, choose a filter that lists both, or measure this one in its box.
- Read the watts on the filter’s label before you use the electricity cost calculator; leave the watts blank rather than entering 0.
A filter rated for your tank can still be too tall for your cabinet or too strong for small fish: see how to choose one.
Check it against your tank → Something not working? See the troubleshooting guide.
Choose and care for mechanical, biological and chemical media before buying replacement supplies.
Included items & upkeep
- filter body
- flow control
- Bio-Grid
Plan for the routine work
- Unplug before impeller access.
- Use the manual’s impeller and intake cleaning steps.
To budget for replacement media and supplies, use the first-year cost calculator. For how often and how to clean it, follow the maker’s manual.