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20-40i. Troubleshooting Guidelines. Setup. IMPORTANT: Always unplug the Internal Filter before inspecting or disassembling for any reason. 18-12599. Need a manual for your Tetra Whisper 20-40i Aquarium Filter? Below you can view and download the PDF manual for free. There are also frequently asked questions, Step 1. Snap the filter cartridge into the Whisper unit. Ensure that the foam grid faces the front of the filter. Power Filter · 1. Attach the filter hanger to the track on the back of the filter · 2. Clip the filter to the back wall of your aquarium frame (Fig. · 3. Insert For more information about the Tetra Whisper 40 Power Filter, see the Manufacturer's Instruction manual. For more info on Hang-on Power Filters, please seeCarefully examine the appliance after installation. Model 40 #25774 Whisper® Power Filters are not recommended for use with aquariums that have sand