which is your favorite out of these and why

I voted firefish. They are beautiful fish, don't need a lot of swimming room and their personalities are great. Plus they are easy and will eat anything!

 

yellow watchman - very non-invasive gentel creatures

fire fish- keep your lid on, they can be jumpers

a single red cardinal- even a pair, would work too.

 

I voted for a couple.

A firefish is a nice choice for color, but get a couple inches long. With two clowns they probably would be a great choice.
Court Jester gobies are my favorite! I felt so bad when mine died. I think they are really pretty with alot of color and fun to watch. Plus, they stay small!
Lastly i voted for the prawn goby because they are pretty! I have a blue spotted prawn goby and he is a blast. I didn't see him for the first two months but now hes out all the time (I thought he was dead lol) Unfortunately they get big, so it might not be a great fit either.

My unasked and probably unwanted advice is to ditch the clowns. They can be really mean to other fish and in such a confined space could bully anything else to death. Either that, or start another tank with a variety of these fish.

Also you left off green clown gobies which are some of my favorite

 

We need more cowbell!!! ....oh and more votes too

 

i like the Yellow Watchman Goby !!

 

Court Jester Goby, in a tank with a decent sand spread.