[Smeagol]

This might be a dumb question.... Do you turn your canister filter off when you do a water change? I always unplugged my HOB's during water changes, but someone told me you should NEVER turn off a canister except when you clean it.... Something about anaerobic shock (whatever that is).

 

[exv152]

I just turn my in-tank heaters off, but because I never do more than 50% wc's the filters stay on, but you can turn off the canisters too if your maintenance is not going to take too long.

 

[GitMoe]

I turn mine off every time for water changes (once a week). Always have. Never an issue. Never heard not to turn it off...

I also close in and outflows so it's not like the canister fills with air. It just holds the water for maybe 20 minutes with no flow.

 

[randpost]

I turn off my canisters also. I don't see how half an hour at most would cause any harm. How do you clean a canister if you never turn it off?

 

[pantherspawn]

I tuen off all filters lights and heaters when doing water changes. Never had an issue.

Sent from my SGH-T889 using Tapatalk

 

[jrman83]

I have left mine off for hours at a time when doing big scape changes or major trimmings in my 125g tanks. Never had an issue.

 

[MERSF559]

iturn everythn off except lights when doing wc. no iasues here either