I turned my Amiracle SL150 into a sump. Replaced the bio-balls with a few pieces of live rock. Have the inlet hose just laying at the bottom wedged under the live rock. I also have a AquaC Remora skimmer
hanging on the same side as the live rock and the inlet.
On the outlet side, I have my return pump and heater. I did leave the foam insert in between the two sides.
I was hoping to somehow convert it to a sump/refugium but started getting mixed feelings after looking at some of the threads on fuges.
Before I removed the bio-balls, my nitrates were off the charts. Since then I have gotten them down to less than 10ppm. So far things are going well so I will probably ditch the refugium idea.
If I had it to do over, I would have saved a lot of money and just setup the sump using a rubbermaid container. I had the Amiracle trickle filter
from a few years back when my setup was fish only without any live rock.
I am enjoying the hobby so much more since I went the reef tank route with live rock/live sand.