12-02-2012, 05:48 PM
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Angelfish need a school, it allows the aggression to be spread out among several fish instead of all on one like you have now.
A 30 gallon is far too small for the minimum school size of 5 angelfish. The only way to keep angelfish in a tank that small is with a mated pair, a male and female that have formed a pair. You can't force a pair, the male has to choose the female.
55 gallon is the minimum tank size for a school as has been said.
Neon Tetra however actually do much better in a larger school, 6 minimum but 8 is far better. Another problem is they are the natural food of Angelfish in the wild, small torpedo shaped fish like that will eventually get eaten once the angels get large enough.
What kind of algae eater? The Chinese Algae Eater? Terrible fish that one, turns real nasty and gets large. Not a fish for any community tank, ever. They most especially can not be kept with Angelfish or any other flat bodied fish, they'll latch on and suck away. The real irony is, they're terrible at eating algae despite their name.
Back to the Angelfish ... unfortunately you most likely will not be able to buy more, even if you get a large tank. It's possible but if and only if all the new angelfish are the same size. You could not get 3-4 new juveniles and put them in with the larger angels.