My 20g saltwater

[Saltghost2k25]

So.I'm just wondering if my mini saltwater tank looks good.I have
1.true percale clown
2.bicolor thing(forgot name)
3. 2x peppermint shrimp
4. 3x hermit crabs

1.about 20lbs of live rock
2.a rio powerhead
3.100w heater
4. 150mariland filter
5.rio protein skimmer

This tank has been good and running for a few months with weekly water changes..
Can I add more fish?
Thank you I am new to this forunms

 

[Strawman]

it's beautiful. maybe one or two smaller fish thats all

 

[Henry405]

could it be a bicolor blenny? or a bicolor dottyback?