i have a 10 and a 20 and the main difference i have found is the impeller size. the 10 puts out a jet stream where as the 20 is a bit more wide spread.... i have found the 10 to pull very hard inwards in order to produce the flow and i have had to pull a mangled sandsiftng star out of my 10 on may occasions.
My 2 cents.....
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72 Gallon Bowfront Reef.. Hardware:2x250w Luminex Elite HQI Reflectors (Phoenix Hexarc Bulbs), Galaxy 2x250w Electronic ballast, Euroreef 130 Skimmer, Sedra KSP 7000 Retern... Live Stock: Pair of Hawaiian Flame Wrasse, Leopard Wrasse, Pink Streaked Wrasse, Pair True Percula Clowns, Potters Angel, African Flameback Angel, Orange Fin Tomini Tang, Yellow Assessor, Tailspot Blenny, Purple Firefish..
45 G FW Asain Barb Community tank.
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