Looking for a particular thread- 2 x 20l water change tanks on a big system

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Looking for s particular thread I saw a while ago. Bookmarks are all screwy and now I can’t find it- please help!

Anyway- it was a large system, basement sump/ fishroom. As part of the filtration, there were 2x 20long tanks plumbed in before the sump. They could be isolated and a valve turned to drain 20g from one, while the other was filled with fsw to perform a water change.

I believe one of the tanks developed a crack at a bulkhead during a remodel of the area, and it was taken offline.

Really looking to emulate this with a 29 g tank, but could use a refresher on the pics.

Cheers for any help!
 

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