Ehhh don't know what you mean by tall and bulky but I have the Aqua C Remora, and I know they sell the smaller Aqua C Remora Nano. Don't know the exact gallon rating but for a 29 it would probably work. My opinion though is not to skimp on this because although it may be larger, the benefits to your aquarium are much better....... Or just use this as the perfect excuse to build that sump you've always wanted LOL