Planning to start one new tank, size 60cmX30cmX36cm. Volume 64.8 liters without any substrate and all. Want to go for Eheim Classic filters with Bio Rio as media. But confused between Classic 2213 and 2215. According to the company website 2213 (even 2211) is sufficient for my tank size, with 400 l/hr, and 1.5 m head. But the local dealer is saying that 2213 will have a reduced flow rate once the media will clog, so he asks me to go for 2215, with 620 l/hr and 1.8 m head. But 2215 will cost me 1.1k more. And really do not want to spend more money if 2213 is gonna serve the purpose.