08-02-2010, 08:42 AM
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Originally Posted by Aly
Then she goes on to tell me that a 50 gallon filter would overfilter(WHAT?) an almost 30 gallon tank!??? I told her that I had a filter meant for 100 gallons (fluval 405) on my 55g and that my fish were fine. (two mins till store closing) She says I am wasting money because too much water will be going through the filter and that I will have to replace the filter media very often. Does that even make sense???
No, it doesn't really make a lot of sense. You can't over filter the water. What you can do is create too much flow in the tank. Ignore the stated gallonage ratings they give you on filters and such. Pay attention to how many gph (gallons per hour) it flows. You're typically going to want something between 5 and 10 tank volumes per hour with a HOB. In your case that's between 130 and 260 gallons per hour. Personally I'd split the difference and say something in the 200 gph range will be spot on. As for filter media the only one that really "wears out," is carbon which isn't really that useful anyways unless you're trying to remove tannins or medications. Otherwise you're just wasting your money on it. And even if you are running it the rate it is deactivated is proportional to the pollutant concentration in the water and the size of your tank not the filter's flow.
As for the size, personally I'd keep the 26 gallon. Believe me, bigger is better (easier to take care of) and a couple months after buying the 16 you'll be saying, "Wow, wish I'd kept the 26."