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Hi Everyone,

I have a 6x2x2 that I used to breed Frontosa in but sold the fish and shut the tank down, I'm setting it back up with water out of the tap but the sump is still full of the old water and media.

Q1 Do I need to empty the sump and clean before adding 2 Calvus

Q2 How long do I need to run the tank before adding the 2 Calvus.

It may be a simple thing but it has been years since I have set up a tank lol.

Cheers

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Unless the sump has been running on it's own in circulation and the bacteria is being fed it's not going to work. The media I your sump will be dead and when you turn it on with your tank Hooked up you are going to pump that rotten water into your tank. Clean it all properly and start a cycle to be safe

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