Do you plan on placing the filter on the back or the side of your tank?
I've run both an AC50 and AC70 on a 29 gallon at different times.
Currently I'm running an AC70 on the side of my 20L, and it's turned down to it's lowest setting. If I were running a 29 gallon it would be in the same position but turned all the way up.
Whatever you decide on, DON'T go with the AC50. You'll be disappointed with your flow and media space limitations.
The AC70 is so worth the $10 difference.
Last edited by sdbrewer; 05-02-2013 at 06:44 AM.
Reason: more info