I think the Whisper Power filter is going to be quite undersized for a high light co2 injected 29 gallon. What would be ideal, would be to run 2 cannisters on your 55. You could start 1 of them on the 29, then you would have a cycled filter when you moved over to the 55.
29 gallon, Fluval 306. Aquatop PF25-UV Power Filter, 1x39 watt T5HO 7" above tank. P.F. Sand, Pressurized CO2, 5 Glowlight Tetra's, 3 Halequin Rasborah's, 3 neons, 2 Oto's, 5 Cherry Shrimp, 4 Amano Shrimp.