01-18-2011, 03:25 PM
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I bought the Rena Model 200, it was the loudest of all. The Tetra 40 I first had worked great, it was quite and powerfull enough for the air wand (still debating if I should of bought an air stone, just for more bubbles). The Tetra 60 was quite a bit louder then the 40 with noticable air flow difference. I emailed the company, they said the 40 should put out 1.6 liters per minute, the the 60 putting out 2.6 liters per minute. Theres no way it was even coming close, even with the two lines connected into one. According to the Renas box it should of put out around 2.4 liters per minute, no way in H#% it did, haha. I'm thinking about going to my local FS and purchasing both the Tetra 40 and 60 in order to do a side by side comparssion, eventullay taking the lesser back.