I will get the Emperor 400 since you tank is about 30 gal. you will have more than enouph filtertration! Here is a rule of thumb mulitply your tank gal by ten for example 29*10=290
Here let me try to provide you with a link
http://www.petsmart.com/global/product_det...D=1104638904594Emperor Power Filters
This is the first power filter to combine high-end performance with multiple filtration options. Filter features not one pump (as in ordinary power filters), but two separate water pumps. The Flow Pump directs water through the high-capacity Emperor Rite-Size Filter Cartridges and Media Containers. The BIO-Pump then pressurizes and sends streams of pre-filtered, oxygen-rich water through the adjustable spray bars to power each BIO-Wheel. Ready-to-use cartridges have more mechanical and carbon filtration than any other cartridge. Provides superior biological filtration. Filter cartridges sold separately.
Model Flow Rate Aquarium Size Replacement Cartrdige Size
280 280 gal./hr. up to 50 U.S. gallons One Rite-Size "E" Filter; 4 oz. Refillable Media Container Spray Bar Driven BIO-Wheel
400 400 gal./hr. up to 80 U.S. gallons Two Rite-Size "E" Filters; Two 4 oz. Refillable Media Container Spray Bar Driven BIO-Wheel
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600091 Emperor Power Filter 280 $35.99 qty. *
601488 Emperor Power Filter 400 $42.99 qty. *