I have the 2026 running on my 58 gal
for about 18 months, and I have been delighted with it. The filter is whisper quiet and is well built. Eheim has an excellent reputation for design and quality, however, not all lfs
carry Eheim spare parts and media.
Based on my own experience with the 2026, and what I've read about the 2222 on the Eheim website, here are the main differences.
The 2026 has a self priming feature that is useful when you are first setting up, or cleaning the unit. Pressing the large button on top of the filter purges air out of the return hose, and fills the intake hose with water. The 2222 doesn't seem to have this feature.
The 2026 has a built in flow gauge and you can adjust the output with a lever. Again, these features appear to be lacking in the 2222.
The 2222 is rated at 132 gal
/hr, and recommended for tanks up to 40 gal
. The 2026 is rated at 251 gal
/hr, and recommended for tanks up to 92 gal
The 2222 would be more than adequate for your fully stocked 29 gal
If you see yourself upgrading to a 55 in the next two or three years, then the 2026 may be a better investment for the extra 55 bucks. By adjusting the spray bar and/or the flow output, you can avoid excess current that may disturb your plants.