Would like to add more fish, just not sure what ...

Well, we are thinking of adding two more fishes in the next couple of months, but we are not really sure what ! If you guys could give us suggestions, it would be greatly appreciated
Here is what we have:
* Red Sea Max 250 aquarium (66 gallons)
* 100lbs of live rock
* 80lbs of live sand (60lbs reef sand and 20lbs bimini pink)
* Gold stripe maroon clownfish
* Coral beauty angel
* Orange stripe prawn goby
* Gold head goby
* Eyelash blenny
* Imperator angel (well, it's MIA, I think the BTA might have gotten it ...)
* Green bubble tip anemone
* 4 baby skunk cleaner shrimps
* 2 peppermint shrimps
* 2 astrea snails (pretty big as they are about 4-5 years old)
* 3 mexican turbo snails
* 5 trochus snails
* 12 blue leg hermit crabs
* 4 emerald crabs
* black sea urchin
* frogspawn (4 heads on one stalk)
* 3 various little frags
* Red favia
* Orange fungia
* a few hitch hicker sponges
* pulsing xenia
* green mushrooms
* 4 clams (came on some LR I got)

I think that's about it, parameters of the tank are as follow:
Temperature: 79-81
pH: 8.1-8.2
sg: 1.023-1.024
Nitrite: 0
Ammonia: 0
Nitrate: 5
Phosphate: 0
dKH: 9
Calcium: 400
Magnesium: 1400

we really liked the Imperator angel, but it dissapeared a couple of days after we added it (looked and acted heatlhy)
Would adding 2 more fishes (considering the Imperator is gone) be too much for that tank ? And what fishes should we look into ?

 

Maroon clowns get big and coral beauties can get big too

You wouldn't have been able to keep that imperator for more than 9 months. They grow fast and would quickly overload your biofilter.

I wouldn't suggest adding anything bigger than a small psuedochromis or wrasse that stays small. You have to think of their adult size and not their current size when stocking.

 

well, here are the sizes I go by that I found online:

Gold stripe maroon clown fish: 6"
Coral beauty angel: 5"
Orange stripe prawn goby: 4"
Gold head goby: 7"
Eyelash blenny: 6"
Imperator angel: 9"

Which gave me a total of about 37" total adult size, I have read here and elsewhere that a good number is 1" per gallon, so I should be able to have 55-60", which still gave me another 20" or more, I was thinking two smaller fishes so that I would be around 50" total, or would that be too much ?

 

1" per gallon would be way overstocked, That rule is for freshwater.
IMHO you are already a little overstocked. I would not add anything more.

 

wwooppps alright, didn't know that was for freshwater.
just to make it clear though, we do not have the Imperator anymore.

 

i go off 1 inch per 5 gallons. but a wrasse would be coool if you were gonna add something. coloring is very nice.and finwork is very beautiful.