Rsm 250 14 fish overstocked?

[eguld]

I have a rsm 250 with 9 fish and I plan on adding 5 more (my must haves), they are almost all fairly small fish. Will it be overstocked? I do 10G water changes every 2-3 weeks would that need to change?

Current fish:
2 false percs
2 circus gobies
2 filefish
1 mystery cardinal (passive personality)
1 watchman (might return: he is not pairing with pistol shrimp)
1 six line wrasse ( in my old tank waiting to go into rsm)

5 to be added (over the next 2-3 months):
2 Ora mandarins (psychedelic mated pair)
2 bangaii cardinals
1 copperband (to eat aiptasia, not sure if he will be ok long term)

Thanks in advance!