If I had a fishroom I would have built a fuge that could gravity drain back into the tank. I'm not 100% convinced that a return pump kills every last pod etc as it leaves the fuge but gravity would mean more live food entering the display. I figure with a hang on back style you could maybe have it supported off the back but be higher than the display...
I've heard from some that small fuge's do nothing and I've heard the opposite. I decided to have one again mostly because I used to watch my old one A LOT. When the display tank goes dark I still have an excuse to be hanging around the tank =)
My last one had nothing but Chaeto. This time I'll add some sand and rubble too. Depends if you want to only grow algae or house a thriving pod population although Chaeto makes for great pod-condos alone...
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