Hello Quinton! You nano is indeed looking good. AND the fish are indeed colorful. BUT - as Kanga and other have said before. The problem with the tangs, are partly that they require a LOT of swimming space, partly that they are territorial, and partly that this size tank will most likely cause them extreme stress. The thing is - yes - you CAN possibly keep the tangs alive in the nano. BUT, you would most likely end up experiencing that they start suffering from marine ich, due to the stress.
Now - I am EXTREMELY glad to see that you say that you have a MUCH bigger tank in the pipeline. So, that you could at least move the tangs to this tank.
I love the midasblenny! Awesome little fish!
What lighting do you have in the tank? Perhaps, if your lighting is not 100% (clams require a LOT of light to be happy), perhaps you could add a little bit of invert food in the mean-while to the tank's water (don't try and target feed the clam - it will filter out the food it requires out of the water column)....
Good luck! And enjoy your artwork!