Tetra Whisper IQ Power Filter

The Tetra Whisper IQ is a hang-on-back power filter built around low noise. Tetra fits it with a sound shield and says it runs under 40 dB. The motor sits underwater, so it primes itself: hang it on the tank, fill it, plug it in and it starts moving water.

Two sizes

• Whisper IQ 45, the size this page leads with: 215 GPH, for tanks up to 45 gallons, model 78003-00.
• Whisper IQ 20: 130 GPH, for tanks up to 20 gallons, model 78001-00.

Choose by tank size. A 45 on a small tank can push more current than bettas or small fish like.

Cartridges and upkeep

Both sizes take large Tetra Whisper Bio-Bag cartridges, sold separately. Tetra says to change them monthly. One tip: the cartridge holds part of your beneficial bacteria, so swapping it out removes some of them. Rinse the old one in tank water when it isn’t badly clogged, or swap cartridges at a different time from big water changes so the biofilter isn’t hit twice at once.

Tetra also describes “Stay Clean” technology that helps keep pH healthy and cut down on maintenance. Keep doing regular water changes anyway.

Setup tips

Leave room behind the tank for the filter body; the IQ 45 measures about 7 x 6.25 x 8.75 inches. If you keep shrimp or fry, cover the intake with a pre-filter sponge so they aren’t pulled in. In a brand-new tank, a bacteria starter like Seachem Stability helps the filter start working sooner.

Warranty

The IQ 45 listing shows a 5-year limited warranty. The IQ 20 listing just says to see the label, so check the box for that size.

Who should look elsewhere

For tanks over 45 gallons, or if you want to choose your own media, a larger filter like the AquaClear 110 or the Aqueon QuietFlow 50 gives more room.