in my 72 gallon I use a Fluval 405 external canister filter. And through out my other tanks I have used a Marineland Emperor 280 Hang on the back filter for my 30 gallon, a Cascade 300 internal canister and a Elite Stingray internal canister for my 10 gallons, and a Whisper hang on the back filter for my 10 gallons
- - all always left running....maybe turned off for a maximum or 20-30 min for a water change (more time needed for the 72 gallon obviously)
I have never used an undergravel filter because for a long time I only used sand substrates....the only tank that has a different substrate is my 72 gal and I use very small river rocks as a substrate





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