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The only angel that might work is a dwarf. I have no experience with them, so I wouldn't feel comfortable recommending one.
I have tried to keep a small group of Chromis in a 30 and failed miserably twice. All but one died within a couple weeks both times. The one that was left wound up hiding in the corner for the rest of its life, seemingly afraid of its own shadow.
I can't help much with sand sifters either. I've had really good luck with Nassarius snails, but they just bury themselves and don't do much sifting. They would help keep the top layer aerated, but that's about it. If you do get some, get the big ones. Sometimes they're referred to as Super Tongan. Petco sells them for less than $2 apiece.
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“It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt. ~Mark Twain~”
Current Tank Info: 55 gal FOWLR w/15 gal above tank refugium, 10 gal nano FOWLR
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