what is refugium?

There are a lot of macro species that are great for the DT.

 

It's not bad. Do you know who Tangster is. Evan a while back he did not come around much. But he had a set refugium recipe, and he said he had used it for 20 years. Owned a fish store and set up all his clients that way. He said any good fuge should look like a swamp. I could never bring myself to it, but plenty followed his advise and had very slow flows.