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External Filter yay or nah
#1
Hello All,

I have a 85 litre tank and was wondering what the advantages of getting an external filter would be? My brother in law gave me his Fluval U4 so I currently use that but without full flow as I have a Siamese Fighter.

Would an external filter help circulate my Co2 flow and aid my carpet plants to thrive?

Do you recommend any filters?

Cheers
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#2
dont know much about the plants and co2, one benefit of external would be more space in your tank, unless there’s a dedicated enclosed space at the back of the tank, which is what we have in our Fluval Flex.
Bikini Bottom - 168l
Bronze & Albino Cory, Black Widows, Cherry Barbs, Green Tiger Barb (rescues), Amanos.
The Kremlin - 58l 
Bronze Corys.
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#3
External gives more space in the tank and adds slightly to your water volume, and is easier to clean. They also hold more media (generally) and are more flexible with regards to where you position your flow/intake/outlet

Internal has no risk of flooding your floor, can be used in any tank (bracing or lids can make externals impossible on some tanks), and are generally cheaper for a comparable quality

I wouldn’t add an external to your setup - you’d be better off with an extra air stone
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#4
(15-09-2019, 02:35 PM)audigex Wrote: External gives more space in the tank and adds slightly to your water volume, and is easier to clean. They also hold more media (generally) and are more flexible with regards to where you position your flow/intake/outlet

Internal has no risk of flooding your floor, can be used in any tank (bracing or lids can make externals impossible on some tanks), and are generally cheaper for a comparable quality

I wouldn’t add an external to your setup - you’d be better off with an extra air stone
Why wouldn’t you? I do like the idea of less clutter in the tank and cleaner water!
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#5
Flow, mostly. Betta don’t like lots of flow (particularly long finned varieties) and it can exhaust and stress them.

A U4 should already give you around 8x tank volume per hour of flow (1000 litres/hour, say 700 after losses due to media) which should be plenty for filtration and to ensure carbon/oxygen/nutrients are getting to your plants

Going for a flow rate much above 8x capacity per hour with a Betta is asking for trouble IMO - they’re one of the few fish which have a low tolerance for flow
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