Hello, i am looking for some advice regarding a choice of extrernal filter for my new 24"x15"x12" planted tank. I have been doing a bit of searching on this forum and it appears that the ideal turnover rate is around the 20x tank volume per hour rate, is this right? From that i am thinking something along the lines of 1000-1200lph would be about right. Now i have a spce issue in that the space in my cabinet is around 30cmL x 30cmW x 43cmH, so the filter has to fit into this space. I have been looking at the Tetratec 1200 which i like and the Fluval 405, are these any good? Any advice much appreciated, Chris.