Is this overkill on corals for a 20g ?

[DEAD_BY_DAWN]

1.lg bubble coral
2.frog spawn frag
3.pumping xenia
4.anthelia frag
5.three types of mushrooms
6.three typs of xenia
7.cabbage coral frag
8.toadstoll leather sm
9.brown and green polyps lots
10.green stars frag
11.Montipora digitata frag
12.blue tip formosa frag
13.hammer and candy cane frag on the weekend
i realize in time the frags will grow and need to be reduced but will any serious problem come about to this mix