Planted Tank Guru
Join Date: Jul 2008
Location: East Lansing, MI, USA
Tetra Whisper 3i (hoping to find a way to turn this into a C02 diffuser. Any ideas)
The design of the 3i, leaves room around the small power head. Take the bottom off or apart. Some use screws, others don't. Drill a 3/16" hole in the bottom of the base. Thread your CO2 line through the hole. Cut off the line, fairly close to the bottom of the assembly. The bubble will get sucked through the power head and chopped by the impeller. Given the location of the filter - noise should be really obnoxious.