My Vote is do both if possible, even if you can add a samll refugium to your system you wil help it out, it sdoesn't HAVE to be 30% or more of your total water volume.
I run a thirty gallon cube fuge, with a biopellet reactor, and zeo. I figure you can't go wrong by adding a refugium of any size. Throw extra rock in it, let the small critters explode in growth and numbers, or leave it dark and let the sponges and filter feeders take it over.
I know of a person who used the pellets and bleached out his tank, i also know of a person that used them and got freat results, I decided to split the difference and use 3/4 of the zeo that you are supposed to use, and 1/2 the amount of pellets. It seems to be working for me, just enough so that my colors are super vibrant, but most importantly, not too much so that no algae grows.
Try both if you can
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90 gal SPS display+65 gallon mixed reef
GEAR: Korallin calcium reactor, bio pellets, digital aquatics controller, Tunze ATO, MP40, 4 x Tunze 6105 w/controller, Reef Octopus Xp3000 ext, 2x250w MH, Futura LED.
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