What's the one most beneficial change you have made to your tank?

Yea no doubt mooch
Last lfs bought some needed a 911 toP off. I got it next morning checked b4 work I had an algae propagation tank.
 
most beneficial change !

most beneficial change !

Took out my double biowheel filter and added a refugium with liverock a deep sand bed and macro algea....:dance:
 
I just added a skimmer to my 125g, 20g cube, 16g fragtank AIO. I thought having a big fuge would be enough. All my parameters were in check, but my sps showed slow growth. After added a skimmer, polyp extension increase and growth has gotten better. They're must have been a lot of DOC's in the water.
 
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