Posted: Sat Nov 21, 2015 12:45 pm Post subject: Re: EHEIM Classic 250
The length of the tank is of secondary consideration. First and foremost, the litre per hour or gallons per hour filtering capacity of the stated filter should be 4-5 times the volume of the fishtank. Meaning that, a 30 gallon tank should use a filter with a rated output of 120 gallons per hour or more.
That being said, if you have a 5 feet long, 1 foot wide, and 1 foot deep tank, the flow from the filter will not reach the extreme ends. Thus you will have to install wave-makers or smaller IPFs to achieve the desired kind of water flow, so that all the water actually can pass through the filter.
Eheim is a great choice. Its bloody costly to buy the filter and spare parts. However, you are guaranteed to get spare parts for Eheim filters.
Sun sun filters are also awesome, since they are rather affordable to buy, but I have not seen many spares being available for them. Fluval and other brands are good to start with, but its next to impossible to get spares for them.
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