Ryan,
If you are incredibly lucky & get a male & a female, then 2 cherubs might pair off (although 20g is a bit small for 2 dwarf angels). If you're unlucky & choose 2 males, they will fight like crazy, especially in a small 20g. Mine would take on yellow tangs & maroon clowns 3-4 times bigger than it & not back down. It's generally a peaceful fish but it won't take any attitude from anybody. With 2 males, you would have them fighting for territory & dominance all the time. You should research if there is any sexual dimorphism (physical dif. between the sexes) before you even attempt putting 2 into a 20g. JMO.
Anthony
If you stick with one, you'll really love having this bright, spunky jewel swimming around in your tank.
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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