Hey, I'm using the AquaC Remora and couldn't be happier with it's performance. I traded in my RedSea Prizm for it... (that is an absolute POS... that I wouldn't recommend to anyone) I don't have any experience with the other one you metioned but the Remora is quiet, efficient, and works very well. How much foam you get depends on how high you have your collection cup adjusted. I've got mine set as low as it will go and I'm getting on average of about 1/3rd of a cup per day. In your case with a smaller 20g tank simply adjust the cup up a little higher. HIGHLY RECOMMENDED.
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45 gal fowlr,
fluidized bed, UV ster, Rimora skimmer
25lbs Fiji / African LR
1 percula clown
1 diadema dottyback
1 6 line wrasse
1 juvenile picasso trigger
1 Coral Beauty
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