i have a 15 biocube and tryed the fission and got some wet scudge in my cup after 2 days or so ,,, but the bubbles were every where. so i bought the seaclone 100 and set it on the tank so it pulls from the main tank and returns to the return section of the filter. i had to increase the flow of the filter by using a bigger pump to keep up with the load, i also put some sponge on the outlet of the seaclone to reduce the bubbles. im happy with the results, ive had a baseball sized acro (growing) in it for over six months
your 29 gal is bigger and may fit the seaclone better than mine, my tank has no hood, so you will have cut your hood to make it fit
all that said, it is probly less work just to increase the frequency of the water change
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