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Old 03-25-2015, 01:49 PM   #1 
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Join Date: Mar 2015
Location: Dallas
Question Filter options??

What is the best, least powerful, least expensive filter that i can buy for a 3.5 gallon tank?
I think the one i have is too much for him.
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Old 03-25-2015, 01:52 PM   #2 
Join Date: Jan 2014
I use the Azoo Mignon 60. It has a knob you can adjust. I have it in a five gallon and the lowest flow is about as much as my betta can take, in particular with OHM/HM. It's not cheap, but I found it is least expensive as I bought others and they are worthless to me until I finally found a filter that was quite and low flow. Tough to find with small tanks.
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Old Yesterday, 08:13 AM   #3 
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Sponge filter all the way!

They have huge surface area and are very low cost. They do not give the same mechanical filtration as other filters but with one betta there is not much excess waste to mechanically filter, especially if your are on top of your water changes and vacuum the substrate.

xy make some very inexpensive sponge filters. Combine it with a small, quiet airpump of your choice and you will have a nicely cycled tank in no time.
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Old Yesterday, 10:12 AM   #4 
Join Date: Jul 2013
Location: Wisconsin
I highly suggest the Deep Blue Biomaxx nano filter. They have an adjustable flow rate and are very dependable. I have them on all my 3gs.
After that I would suggest sponge filters.
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Old Yesterday, 11:43 AM   #5 
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Sponge filters are great and super cheap, though they do require an air pump and airline tubing. The problem is that, for some reason, the chain stores don't tend to sell them. I got mine at my local fish store; you can also find cheap ones online. They can agitate the surface quite a bit, so I poked some holes in the airline tubing to baffle it a bit.
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Old Yesterday, 06:35 PM   #6 
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Sponge Filter tutorial

Welcome to the forum.
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Old Yesterday, 06:57 PM   #7 
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Location: Tennessee
This one is good and used by a lot of members. It only filters at 16gph (gallons per gallon) which is not too high.
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3.5 gallon, fillter, strong filter, strong flow

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