I do not run a sump, so I have a hob refugium made by CPR on my 125. I would imagine that you could if you have room for it. My green spotted mandarins are fat and happy since I have done this. I buy pods from a supplier that mails them in a filter fiber material. I add the filter to the refugium and let it be for about a month or so. When I take the filter out, I rinse it in a bucket of saltwater, then pour back into the refugium so as not to loose any critters. I have not seen an increase of nitrates from doing this. Only lots and lots of new pods. I have enclosed a pic of my refugium to see an old sponge. Look in the middle of the pic, and over to the right where the black snail is. I added my last batch about Dec 5th. And I just added 1000 more pods tonight, hence the new filter pads. My refugium is jambed packed with life.
I probably won't add anymore for a long while, I watch the refugium to see if the pods are still multiplying. I had to bump up my population after my tank move on Dec 1. A lot of them where lost....got too cold.
Hope this helps. Good luck. I would also add some more live rock if possible in the main tank. Never hurts to reseed your tank.
