you could do a clown goby and a firefish and maybe you could do a tailspot blenny. I only say maybe because my firefish occasionally gets aggressive with my tailspot blenny in my 46g, but it doesn't happen very often
With 2 clowns you will be limited in adding any other fish. The royal gramma is not a good choice. A small watchman goby species will be fine. Other options would include clown, neon, eviota, or trimma gobies, barnacle or pike blennies, or a Plectranthias.
Yes, all those fish can be kept singly.
Watchman, neon goby, and Plectranthias should be kept singly in your setup. The barnacle and pike blennies, as well as trimma and eviota gobies are small enough where you could do a trio.
Court jester gobies rely heavily on microfauna. Unfortunately, sixline wrasses can outcompete them for microfauna, and can be aggressive.
They will coexist. 40g is the minimum for a yellow coris, but acceptable.
If your parameters are fine the neon goby shouldn't be an issue.
Sixlines can be aggressive to new fish and kole tangs can also be aggressive, especially in a tank that small.
65g is too small for any tangs. Choose something else as centerpiece.
I strongly suggest skipping the other maroon clown. A spawning pr of maroons can easily claim 50g of tank space to themselves.
That being said, I really loved my snowflake eel, and you're going to have a blast with a ribbon eel. They are beautiful and sassy little creatures. Of course they hide a lot in the beginning, but you'll win him over eventually and he'll come out to see you when he is really happy in this environment.
I am probably getting a fuzzy dwarf or a mombasa. I had a second maroon but it passed from ich. The maroon I have is still a male. The damsel is too big to get eaten the clown is a little small so might have to wait a little. I thought about triggers my favorite one is the clown trigger. Maybe a puffer but the ones I like my tank is too small for. What is a dottyback? Could I get a wrasse or mandarin to eat all my pods? her is my tank with lots of hiding places.What kind of lion? there are huge differences between the different species. I had a fuzzy dwarf lion in an aggressive tank, so I can tell you all about him. They stay really small. But a Volitian or other types will get really big and eat up your crustaceans and anything that fits in his (HUGE) mouth. The clown and damsel would be fine in my opinion, because they are both fast, aggressive and good at staying out of dodge.
From everything I've heard, a second maroon clown is maybe possible but could be very risky. No personal experience with multiple clowns, but I always wanted two so I did the research. Does your existing clown have a big host nem? Are you planning on upgrading your tank at come point when everyone gets bigger? Do you have a lot, like a LOT, of rockwork? Then maybe you could, with great care.
Also, watchout with the eel... I don't know about ribbon eels specifically, but eels do eat crustaceans and any fish they can catch. Also, if you add an eel to your system, you are not going to be able to get him out without removing every inch of rock, so make sure you're sure.
I would add suggestions for my favorite aggressive fish, but honestly I think you might start running out of space as they grow... I had a Valentini puffer, BUT puffers would eat your crustaceans for sure. I also had a trigger, but I advise against triggers in a tank that size... Oooo you could get a dottyback, but read up on those guys carefully because they are ******** (but can be okay for an aggressive setup). A hawkfish might be fun! They are fast, pretty and fun to watch. Personally I really loved anemones, but again, research and get the proper lights.
Have fun!!
